Physics
Physics
Problem
Which of the following expressions gives the electrical energy consumed by an appliance of power when it operates for a time ? a) b) c) d)Intuitive explanation
Electrical energy is really just the total amount of "work" a device does over time—think of power as the rate at which energy is used. Since power tells you how much energy flows per unit time, multiplying that rate by the duration gives you the total energy consumed. This is a direct application of the definition: energy = power × time.
Intuitive explanation
Electrical energy is really just the total amount of "work" a device does over time—think of power as the rate at which energy is used. Since power tells you how much energy flows per unit time, multiplying that rate by the duration gives you the total energy consumed. This is a direct application of the definition: energy = power × time.