How can power be calculated in an electrical circuit?

Power in an electrical circuit is calculated using the relationship between voltage (V), current (I), and resistance (R). The correct formula, Power = V x I, indicates that power is the product of voltage and current in a circuit.

When voltage is applied across a circuit, it pushes the current through the resistance. The higher the voltage or the current, the more power is consumed or produced in the circuit. This relationship is fundamental to electrical engineering and is rooted in Ohm's Law, which relates voltage, current, and resistance, where V = I x R. Thus, if you rearrange Ohm's Law to express power, multiplying voltage by current gives you the amount of power being utilized in the circuit.

This power calculation is critical for ensuring that electrical systems are designed correctly, allowing technicians to size circuits and components appropriately to handle the expected loads without overheating or failing.