How can wattage requirements be calculated?

The correct method to calculate wattage requirements is based on the relationship between volts, amps, and watts described by the formula: Watts = Volts x Amps. This formula is derived from electrical principles, specifically Ohm's law, which states that power (in watts) is the product of voltage (in volts) and current (in amps).

Understanding this relationship is crucial in various fields, including electrical engineering, home wiring, and even in planning for appliances' energy consumption. By multiplying the voltage provided in a circuit by the current flowing through it, one can accurately determine the total power being consumed or used by electrical devices.

The other options presented do not accurately reflect the principles of electrical power calculation, thus making them invalid for determining wattage.