ASVAB (Armed Services Vocational Aptitude Battery) flashcards

A type of bipolar junction transistor (BJT) amplifier configuration where the emitter terminal is common to both the input and output signal paths.

• Provides high voltage gain and high current gain (high power gain).
• Output signal is 180 degrees out of phase with the input signal (inverting).
• Has medium input and output impedance.
• Most commonly used BJT amplifier configuration.

Memory trick: CE = Common, Great Gain; CC = Current, Unity Voltage; CB = Base, High Voltage, Low Current.

A circuit in which components are connected across the same two points, providing multiple paths for current flow.

• Voltage is the same across all parallel components.
• Total current is the sum of currents in individual branches (I_total = I1 + I2 + ...).
• Total resistance is less than the smallest individual resistance (1/R_total = 1/R1 + 1/R2 + ...).

Memory trick: Parallel: Paths for Current, Same Voltage, Shared Load.

The number of unique combinations or values that can be represented by a given number of binary digits (bits).

• Each bit has two possible states: 0 or 1.
• The total number of states is 2 raised to the power of the number of bits.
• Examples: 1 bit = 2 states, 2 bits = 4 states, 8 bits = 256 states.

Memory trick: Bits Power Two, States for You.

An electrical device that transfers electrical energy between two or more circuits through electromagnetic induction, typically to change voltage levels.

• Consists of a primary coil and a secondary coil wound around a common core.
• Operates on AC (alternating current) only.
• Turns ratio (Np/Ns) determines voltage ratio (Vp/Vs) and current ratio (Is/Ip).

Memory trick: Turns-Voltage-Current: Np/Ns = Vp/Vs = Is/Ip (inverse current!).

A semiconductor device used to amplify or switch electronic signals and electrical power.

• Has at least three terminals (e.g., Base, Collector, Emitter for BJT; Gate, Drain, Source for FET).
• Can operate as a switch (on/off) or an amplifier (boosting signal strength).
• Forms the basis of integrated circuits and modern digital electronics.

Memory trick: Switches & Amps are Transistors' Main Jobs.

A passive two-terminal electrical component used to store energy electrostatically in an electric field.

• Consists of two conductive plates separated by a dielectric insulator.
• Measured in Farads (F).
• Blocks DC current (after charging) and passes AC current.

Memory trick: CIRcuits have Capacitors, Inductors, and Resistors.

An electrical device that converts alternating current (AC), which periodically reverses direction, to direct current (DC), which flows in only one direction.

• Most commonly uses diodes (half-wave, full-wave).
• Often followed by a filter (capacitor) to smooth the DC output.
• Essential component in power supplies to convert mains AC to usable DC for electronics.

Memory trick: Rectifiers Make AC Go DC.

Ohm's Law states that the current through a conductor between two points is directly proportional to the voltage across the two points.

• V = I * R (Voltage = Current * Resistance)
• I = V / R (Current = Voltage / Resistance)
• R = V / I (Resistance = Voltage / Current)

Memory trick: Volts are like water pressure, Amps are the flow, Ohms are the pipe's resistance.

In a parallel circuit, the total current drawn from the source is the sum of the currents flowing through each individual branch.

• Voltage is the same across all parallel components.
• Current divides among parallel branches.
• Total current is the sum of individual branch currents (Kirchhoff's Current Law).

Memory trick: Currents Combine in Parallel Paths.

A semiconductor material that has been doped with trivalent impurities, resulting in a majority of charge carriers being 'holes' (electron vacancies), which are treated as positive charges.

• Doped with trivalent impurities (e.g., Boron, Gallium).
• Majority carriers are 'holes'.
• Conducts electricity by the movement of these positive holes.

Memory trick: P for Positive Holes, N for Negative eLectrons.

Gutenberg's invention that enabled mass production of texts, transforming knowledge dissemination.

• Made books cheaper and more accessible.
• Increased literacy rates.
• Facilitated spread of new ideas.

Memory trick: Press Printed Progress, People Learned Proudly.

Photoreceptor cells in the retina responsible for color vision and high spatial acuity in bright light.

• Concentrated in the fovea.
• Detect color.
• Provide sharp, detailed vision.

Memory trick: Cones See Color Clearly; Rods See Dark.

A system of interlinked hypertext documents accessed via the Internet, making information widely available.

• Introduced in the early 1990s.
• Uses hyperlinks for navigation.
• Credited with popularizing the internet for the public.

Memory trick: Web's Wide Welcome, World's Wonders.

The final stage of cellular respiration where the majority of ATP is produced through the electron transport chain.

• Occurs in the inner mitochondrial membrane.
• Uses oxygen as the final electron acceptor.
• Generates the bulk of ATP (around 28-34 molecules).

Memory trick: Glyco Gets a Little, Krebs Keeps Some, Ox-Phos Gets Most.

Weather is short-term atmospheric conditions; climate is long-term average weather patterns.

• Weather: immediate, local, variable.
• Climate: long-term, regional, statistical average.
• One cold winter is weather, not climate change.

Memory trick: Weather is 'W'hat you 'W'ear today; Climate is 'C'lothes for the 'C'entury.

Alfred Wegener's continental drift theory was initially rejected because he could not provide a plausible mechanism to explain *how* continents physically moved.

• Wegener proposed it (early 20th century)
• Evidence: 'jigsaw fit', fossils, rock formations
• Missing piece: mechanism of movement

Memory trick: Wegener had the 'what,' but not the 'how.'

Confirmation bias is the tendency to interpret, favor, and recall information in a way that confirms one's pre-existing beliefs or hypotheses.

• Operates unconsciously.
• Leads to selective evidence gathering.
• Can hinder objective decision-making.

Memory trick: Confirming Convictions, Cautious Criticality.

Fermentation is an anaerobic metabolic process where microorganisms convert carbohydrates into alcohol, acids, or gases, occurring without oxygen.

• Microorganisms (yeast/bacteria)
• Converts carbohydrates
• Absence of oxygen (anaerobic)

Memory trick: No air, just sugar, makes the yeast cheer!

The green pigment in plants that absorbs sunlight to initiate photosynthesis.

• Located in chloroplasts.
• Absorbs light energy.
• Essential for converting light to chemical energy.

Memory trick: Chlorophyll Catches Light, Creates Sweet Oxygen.

A type of lever where the load is positioned between the fulcrum and the effort.

• Load is central.
• Always provides mechanical advantage (>1).
• Examples: wheelbarrow, nutcracker, bottle opener.

Memory trick: FLE 123: Fulcrum, Load, Effort.

An economic principle stating that, all else being equal, as the price of a good or service increases, consumer demand for it will decrease.

• Inverse relationship between price and quantity demanded.
• Represented by a downward-sloping demand curve.
• Fundamental to market economics.

Memory trick: High Price, Low Demand, Down the Slope.

Radar (Radio Detection and Ranging) uses radio waves to detect objects and determine their range, angle, or velocity.

• Emits radio waves and detects echoes.
• Time delay of echo determines range.
• Direction of echo determines bearing.

Memory trick: Radar's Radio Waves Reveal Range and Bearing.

Assuming demand is constant, an increase in the supply of a good or service typically leads to a decrease in its market price.

• More availability reduces scarcity.
• Producers may lower prices to sell excess.
• This is an inverse relationship.

Memory trick: More Supply, Sales Slide; More Demand, Dollars Expand.

The force resisting the motion of a body through a fluid (like air).

• Opposes direction of motion.
• Reducing it improves speed and efficiency.
• Considered in vehicle design.

Memory trick: Drag Down, Speed Up, Fuel Lasts Longer.

A carbon footprint is typically measured and expressed in equivalent tons of carbon dioxide (CO2e), which accounts for all greenhouse gases.

• CO2e standardizes different GHG impacts.
• Includes direct and indirect emissions.
• Helps assess climate change impact.

Memory trick: CO2e: Carbon's Omni-Equivalent.

In cellular respiration, oxygen serves as the final electron acceptor in the electron transport chain during oxidative phosphorylation, enabling efficient ATP production.

• Crucial for aerobic respiration.
• Without it, electron transport chain halts.
• Explains why animals need to breathe oxygen.

Memory trick: Glyco, Krebs, Ox-Phos: Oxygen's the Final Finish.

The shift from nomadic hunting and gathering to settled agriculture led to population growth, permanent settlements, and specialized labor.

• Enabled by plant/animal domestication.
• Increased food reliability (but also risks).
• Foundation for complex societies.

Memory trick: Farm Life Fosters Folks, Forts, and Functions.

A chemical process that improves rubber's elasticity, strength, and durability by forming cross-links with sulfur.

• Discovered by Charles Goodyear.
• Addresses natural rubber's temperature sensitivity.
• Makes rubber suitable for industrial use.

Memory trick: Rubber's Sticky, Brittle, Temperature Trouble.

The adaptive immune system uniquely possesses immunological memory, allowing it to mount a faster and stronger response upon re-exposure to a specific pathogen.

• Develops over time from exposure.
• Basis for vaccination effectiveness.
• Highly specific to particular antigens.

Memory trick: Innate's Instant, Adaptive's Aware.

The cerebellum is a major part of the brain responsible for coordinating voluntary movements, maintaining balance, and regulating posture.

• Located at the back of the brain, beneath the cerebrum.
• Essential for smooth, coordinated muscle activity.
• Damage can lead to ataxia (lack of voluntary coordination).

Memory trick: Cerebellum Cares for Coordination and Balance.

Each whole number increase on the Richter scale (and similar logarithmic scales for earthquakes) corresponds to approximately 32 times more energy released.

• Logarithmic scale for seismic wave amplitude.
• Tenfold increase in amplitude per unit.
• Moment Magnitude Scale (MMS) is more accurate for large quakes.

Memory trick: Richter's Rule: Ten for Tremor, Thirty-Two for Thump.

A black hole is a region of spacetime where gravity is so intense that nothing, not even light, can escape its pull.

• Defined by its event horizon.
• Formed from collapsed massive stars.
• Contains immense mass in a small volume.

Memory trick: Gravity's Grasp, nothing Gets past.

The third layer of Earth's atmosphere, above the stratosphere and below the thermosphere.

• Extends from ~50 km to 85 km.
• Temperature decreases with altitude.
• Where most meteors burn up.

Memory trick: Troposphere, Stratosphere, Mesosphere, Thermosphere, Exosphere: Tall Students Make Terrific Explorers.

Capillaries are the smallest blood vessels, responsible for the vital exchange of gases, nutrients, and waste products between the blood and body cells.

• Connect arterioles and venules.
• Have very thin walls (one cell thick) for efficient diffusion.
• Form extensive networks within tissues.

Memory trick: Capillaries Carry out Crucial Cellular Commerce.

A device that mixes air and fuel in appropriate ratios for internal combustion engines.

• Creates air-fuel mixture for combustion.
• Incorrect adjustment impacts engine performance and efficiency.
• Requires regular maintenance.

Memory trick: Carb Mixes Air & Fuel, Engine Runs Cool.

The Earth's magnetic field originates from the dynamic motion of molten iron within the planet's outer core.

• Known as the Geodynamo theory.
• Convection currents create electric currents.
• Essential for protecting Earth from solar radiation.

Memory trick: Molten core's movement Makes Magnetic Might.

Early writing systems, like cuneiform, were initially developed to fulfill practical administrative and economic needs of organized societies.

• Developed by Sumerians (cuneiform)
• Around 3400 BCE
• Primarily for administrative/economic records

Memory trick: Ancient scribes kept tabs on their Tabs.

Addition is one of the four basic arithmetic operations, representing the total amount of two or more numbers or quantities combined.

• It is commutative, meaning the order of numbers does not affect the sum.
• The symbol for addition is the plus sign (+).
• Used to combine quantities or find a total.

Memory trick: Add liquids together to find the total pour.

To distribute items across multiple hierarchical levels, perform sequential division, dividing the total by the number of units at each level.

• Involves multiple division steps.
• Ensures fair and accurate distribution.
• Applicable in organizational and logistical scenarios.

Memory trick: Divide then Divide again, until each gets their gain!

When calculating the number of items or packages needed, if the result is a decimal, always round up to the next whole number to ensure sufficient quantity.

• Prevents shortages of essential items.
• Applies to situations where fractional units are not possible.
• Common in logistics and procurement.

Memory trick: Total needed, divide by package, then round UP, don't dither!

The impedance that a transmission line would have if it were infinitely long, crucial for efficient power transfer in RF systems.

• Measured in Ohms (Ω).
• Determined by the physical dimensions and materials of the line.
• Matching prevents reflections and minimizes power loss.

Memory trick: To Maximize Power, Match the Line's Z.

Division is one of the four basic arithmetic operations, representing the act of splitting a number into equal parts or groups.

• It is the inverse operation of multiplication.
• The dividend is the number being divided, the divisor is the number by which it is divided, and the result is the quotient.
• Used to determine how many times one number is contained within another.

Memory trick: Divide and conquer, find how many fit.

If there are 'n' ways to do one thing and 'm' ways to do another, then there are 'n × m' ways to do both. This extends to multiple independent choices.

• Used for calculating total possible outcomes.
• Applies when choices are independent.
• Involves multiplication of the number of options for each category.

Memory trick: Multiply options for each part, then you'll have the whole start!

The process of changing a quantity from one unit of measurement to another, such as converting tons to pounds or kilograms.

• 1 ton = 2000 pounds (short ton, common in US)
• Conversions are essential for consistent calculations.
• Often involves multiplication or division by a conversion factor.

Memory trick: Tons of heavy cargo need Pound-ing into pieces!

Homeostasis is the body's ability to maintain a stable internal environment. Feedback loops are mechanisms that respond to deviations to restore this stability.

• Maintains stable internal conditions.
• Involves continuous monitoring and adjustment.
• Feedback loops correct deviations from set points.

Memory trick: Homeostasis: Keeping the house (body) stable.

The three tiny bones (malleus, incus, stapes) in the middle ear amplify and transmit sound vibrations from the eardrum to the inner ear's oval window.

• Malleus (hammer), Incus (anvil), Stapes (stirrup)
• Smallest bones in the human body
• Crucial for efficient sound conduction

Memory trick: Outer collects, Middle moves, Inner interprets.

In an assembly process, the limiting factor is the component that is available in the smallest quantity relative to its requirement per unit, thus determining the maximum number of units that can be produced.

• Identify all components and their required quantities per unit.
• Calculate potential units from each component's total availability.
• The lowest potential unit count is the limiting factor.

Memory trick: The 'least' piece makes the 'most' kits!

To find a fraction of a whole number, multiply the numerator of the fraction by the whole number and then divide by the denominator.

• It represents a part of a total quantity.
• The word 'of' often indicates multiplication in these problems.
• Can be visualized as dividing the whole into parts and taking a certain number of those parts.

Memory trick: Fraction of 'of' means multiply to get the part.

When dealing with additions and subtractions of fractions, carefully determine if the fraction applies to the original total or the current remaining amount.

• Read problem statements carefully for 'of the original' vs 'of the remaining'.
• Involves both multiplication, subtraction, and addition.
• Sequential calculations are necessary.

Memory trick: Start, Subtract, Add, then you're Glad!

States that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. The total mass of reactants equals the total mass of products.

• Applies to chemical reactions and physical changes.
• Matter cannot be created or destroyed.
• Total mass remains constant.

Memory trick: Many Laws Govern Chemistry's Core Principles.

To find the total quantity required when given a rate per unit over time, multiply the number of units by the rate per unit and then by the duration.

• Involves multiplication across multiple variables.
• Ensures all contributing factors are accounted for.
• Common in resource planning and logistics.

Memory trick: Soldiers need Meals Daily, so Multiply ALL!

The generation of new, unwanted frequencies (intermod products) when multiple signals are amplified or processed non-linearly.

• Caused by non-linear components in a system.
• Results in spurious signals outside the original signal bandwidth.
• Often heard as whistles, clicks, or garbled audio in radio receivers.

Memory trick: Whistling signals are Often IMD's song.

To find the total time for a journey with different speeds over different segments, calculate the time for each segment individually and then sum them up.

• Time = Distance / Speed.
• Each segment's time must be calculated separately.
• Total time is the sum of individual segment times.

Memory trick: Divide and Conquer: Segment Times Add Up!

Photosynthesis converts light energy into chemical energy (glucose), releasing oxygen as a byproduct.

• Uses light, CO2, and water.
• Produces glucose and oxygen.
• Oxygen is released into the atmosphere.

Memory trick: Photo-synthesis: Plants making food with light.