A component in an automobile 12-V electrical system has a resistance of 20 Ω. How much energy is dissipated by the component each second?

Question

Quizplus · Accepted Answer

The energy dissipated per second (power) in a resistor can be calculated using the formula P = V^2 / R, where P is the power in watts (Joules per second), V is the voltage across the resistor, and R is the resistance in ohms. Substituting the given values, P = (12^2) / 20 = 144 / 20 = 7.2 watts, which means 7.2 Joules of energy are dissipated each second.

A Component in an Automobile 12-V Electrical System Has a Resistance