Which formula correctly determines wattage in an electrical circuit?

The formula that correctly determines wattage in an electrical circuit is based on the relationship between power (wattage), voltage, and current. Wattage, measured in watts (W), is calculated using the voltage (E) in volts and the current (I) in amperes.

The correct formula is W = E times I, which signifies that power (W) is the product of voltage (E) and current (I). This means that to find the amount of power being used in a circuit, you would multiply the voltage applied across the component by the current flowing through it.

This relationship is rooted in Ohm's Law and the fundamental principles of electricity, where power is the rate at which electrical energy is transferred or converted. Understanding this relationship is essential for anyone working in the electrical field, as it allows for proper sizing of electrical components and ensures the system operates efficiently and safely.

Other formulas presented do not accurately reflect the power calculation. For instance, adding or subtracting voltage and current does not yield a meaningful measurement of wattage, nor does dividing voltage by current provide the correct value for power. Thus, the multiplication of voltage and current is the proper method to determine wattage in an electrical circuit.