NIC Barber Written (Theory) ExamScientific ConceptsMedium
A barber is using a steamer during a facial service. The steamer's heating element draws 10 amps of current from a 120-volt outlet. What is the power consumption of the steamer in watts?
- A12000 watts
- B120 watts
- C1200 watts
- D12 watts
Show answer & explanationAnswer & explanation
Correct answer: C. 1200 watts
Power (watts) is calculated by multiplying voltage (volts) by current (amps). In this case, 120 volts * 10 amps = 1200 watts.
Why the other options are wrong
- A. Incorrect. This would be 1200 * 10, a miscalculation.
- B. Incorrect. This would be 120 * 1 or 12 * 10, not the correct calculation.
- D. Incorrect. This would be 120 / 10, not multiplication.
Electrical Power Calculation
The formula used to calculate the power consumed by an electrical appliance, expressed in watts.
- Power (P) is measured in watts (W).
- Voltage (V) is measured in volts (V).
- Current (I) is measured in amperes (A) or amps.
- Formula: P = V x I.
Memory trick: Power is a 'VIP' (Volts x Amps) in the electrical world!