9.1.8

This document discusses the calculation of power input, efficiency, and an example problem for an induction motor. It defines the power input formula as Pin = √3×VL×IL×cosθ, where Pin is power in watts, V is supply voltage, I is stator current, and θ is the power factor. Efficiency is defined as the output power divided by the input power expressed as a percentage. The example calculates the efficiency of a 40 kW, 415V, 70A motor with 0.88 power factor to be 90.3%.