What is the current drawn by a lamp rated at 300 watts and 120 volts?

To determine the current drawn by a lamp rated at 300 watts and 120 volts, you can use the formula derived from Ohm's Law and the power equation:

Power (P) = Voltage (V) × Current (I).

Rearranging the formula to find current gives you:

Current (I) = Power (P) / Voltage (V).

Substituting the values:

I = 300 watts / 120 volts.

Calculating this, you find:

I = 2.5 amps.

This shows that the lamp draws 2.5 amps of current when connected to a 120-volt supply. Therefore, the correct answer is confirmed as 2.5 amps.

Understanding this calculation is essential as it highlights the relationship between power, voltage, and current in electrical circuits, which is crucial knowledge for an electrical helper in any transit system context.