Answer :
In physics, power is described as how fast you push, or the rate at which work is done or energy is transferred, typically measured in watts (W). The power rating of an appliance indicates its energy use rate rather than total energy consumption over time. Therefore the correct option is ( B .
Understanding Power in Physics
In physics, power is described as how fast you push, which means it is the rate at which work is done or energy is transferred over time. The unit of power is the watt (W), named after James Watt. An electrical power measurement like watts indicates the speed of energy consumption or transformation, rather than how much energy is used over a prolonged period. So, while different appliances may indeed consume different amounts of energy, their power ratings indicate their potential energy consumption per unit of time.
For example, electrical power is calculated by multiplying the current (in amperes) by the voltage (in volts), which gives a result in watts. In practical terms, if one appliance has a higher wattage rating than another, it suggests that the appliance uses more power and, consequently, more energy, assuming they are operated for the same amount of time.
Importantly, the work done by an electrical appliance is the energy it uses to perform a task, whereas force is related to the movement of the appliance if it has moving parts. The power rating on electrical appliances such as light bulbs or refrigerators usually refers to how much energy the appliance uses when in operation and does not depend on the duration the appliance is on.
