What is the formula to calculate power in an electrical circuit?

The formula to calculate power in an electrical circuit is indeed Power (P) = Voltage (V) x Current (I). This relationship is fundamental in the field of electrical engineering and is derived from Ohm's Law and the definitions of voltage, current, and power.

When you multiply voltage (the potential difference) by current (the flow of electric charge), you arrive at power, which is measured in watts. This equation reflects that power represents the rate at which energy is consumed or produced in a circuit. In practical terms, if you know the voltage supplied to a device and the current flowing through it, you can easily calculate how much power that device is using.

The option involving the current and resistance relates to Ohm's Law (V = I x R) but does not directly yield a power calculation. Therefore, understanding this power formula is crucial for anyone working in electrical fields, as it enables the assessment of how efficiently devices operate and helps in designing electrical circuits safely and effectively.