NIC Barber Written (Theory) ExamScientific ConceptsMedium
A barber is using a steamer during a facial service. The steamer's heating element draws 10 amperes (A) of current from a 120-volt (V) outlet. What is the power consumption of the steamer in watts (W)?
- A12 W
- B120 W
- C12000 W
- D1200 W
Show answer & explanationAnswer & explanation
Correct answer: D. 1200 W
Power (P) in watts is calculated by multiplying voltage (V) by current (I). So, 120 V * 10 A = 1200 W.
Why the other options are wrong
- A. Incorrect calculation (120/10).
- B. Incorrect calculation (120*1, or 1200/10).
- C. Incorrect calculation (120*100).
Electrical Power (Watts)
Electrical power is the rate at which electrical energy is transferred by an electric circuit, measured in watts (W). It is calculated as the product of voltage and current.
- Formula: P = V × I (Power = Voltage × Current).
- Watts indicate energy consumption or output.
- Higher wattage means more power used/produced.
Memory trick: Power is like a VIP: Voltage times Intensity gives you Power.