Electrician's Licensing Practice Exam

For a total of 750 watts in bulbs at 120V, how many amps are drawn?

1. 5 amps

2. 6.25 amps

3. 7.5 amps

4. 8.75 amps

The correct answer is: 6.25 amps

To determine the current drawn in amps when you know the total wattage and voltage, you can use the formula: \[ \text{Amps} = \frac{\text{Watts}}{\text{Volts}} \] In this scenario, you have a total of 750 watts from the bulbs and the voltage supply is 120 volts. Plugging these values into the formula gives: \[ \text{Amps} = \frac{750 \text{ watts}}{120 \text{ volts}} \] Calculating this results in: \[ \text{Amps} = 6.25 \] This calculation shows that the system draws 6.25 amps. Being familiar with the use of this formula is crucial, as it helps you quickly determine how much current is being used in electrical circuits, and is fundamental knowledge for any electrician. Understanding this calculation also reinforces the importance of ensuring that the wiring and circuit breakers are rated appropriately for the load to prevent overloads or electrical fires.