What is the correct formula for calculating wattage?

The formula for calculating wattage, which measures electrical power, is represented as W = E x I. This means that wattage (W) is calculated by multiplying voltage (E) by current (I). Voltage is the electrical potential that drives the current through a circuit, and when you multiply that potential by the flow of electric charge (current), you determine the amount of power consumed or generated.

Understanding this formula is essential in various applications, such as sizing electrical components, calculating energy consumption, and analyzing circuit efficiency. In practical situations, if you know the voltage supplied to a device and the amount of current it draws, you can easily calculate how much power it is using.

The other formulas provided do not accurately represent how to calculate power in terms of voltage and current. For example, W = R x I would imply that power is calculated through resistance and current, which doesn’t align with the fundamental principles of electrical power.