In a motor, how is the input power (Pin) defined?

The input power (Pin) in a motor is defined as the power supplied to the motor from the source. This measurement is critical as it represents the electrical energy that is converted into mechanical energy by the motor during its operation. Understanding this concept is essential for evaluating the efficiency and performance of a motor, as it provides the baseline for assessing how effectively the motor uses the supplied electricity.

Factors such as the voltage applied and the current drawn from the power source come into play when calculating the input power. It is important to note that input power is not simply the total power available for operation, as this includes losses and inefficiencies that occur during the conversion process. Therefore, focusing on the source of energy and its direct relationship to motor performance clarifies why the provided definition of input power is the most accurate within this context.