How is electrical power calculated?

Electrical power is calculated by multiplying voltage by current. This relationship is defined by the formula:

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

This equation reflects the basic principle that the amount of electrical power used in a circuit depends on both the voltage supplied and the current flowing through the circuit. When you increase the voltage while keeping the current constant, or vice versa, you effectively increase the power.

The other formulas, while related to electrical concepts, do not correctly represent the calculation of power. Current multiplied by resistance would yield voltage (Ohm's Law), resistance divided by current does not yield a meaningful electrical quantity, and current divided by voltage gives you a ratio that does not pertain to power. Therefore, the correct estimation of electrical power is centered on the relationship of voltage and current as specified in the correct choice.