What is the formula to calculate electrical power in watts?

The formula to calculate electrical power in watts is defined by multiplying voltage and current together. This relationship is derived from Ohm's Law, which states that voltage (V) across a circuit is equal to the current (I) flowing through it multiplied by the resistance (R). When rearranging these fundamental principles, power is recognized as the product of voltage and current.

In practical terms, if you have a circuit where you know both the voltage supplied (in volts) and the current flowing (in amperes), you can determine how much power is being consumed or produced by that circuit by simply multiplying these two values. This means if a device operates at 10 volts and draws 2 amperes of current, the power consumption can be calculated as 10 V × 2 A, resulting in 20 watts of power.

The other options provided are not valid representations of electrical power. The first option incorrectly suggests the addition of voltage and current, while another option implies a division that does not yield power. The subtraction in the last option is also not applicable in this context. Thus, the correct answer accurately reflects the fundamental relationship used to determine electrical power in a circuit.