What is the equation that defines watts?

The equation that defines watts is expressed as Watts = Voltage x Current. This relationship comes from the fundamental principles of electrical power. Power, measured in watts, is calculated as the product of the voltage across an electrical component and the current flowing through that component.

In practical terms, this means that if you know the voltage and the current in a circuit, you can easily determine the power being consumed or delivered by that circuit. For example, in a simple circuit with a light bulb, if the voltage is known to be 120 volts and the current flowing through it is 2 amperes, you can calculate the power in watts as 120 volts multiplied by 2 amperes, resulting in 240 watts.

The other options do not correctly represent the relationship between the different electrical quantities in the context of calculating power. The second choice mixes different relationships in Ohm's Law and does not represent power. The third choice describes a different calculation that does not pertain to power. The final choice incorrectly suggests that power can be calculated by simply adding voltage and current, which is not aligned with the principles of electrical power calculation.