# Calculating Input Current for an Electric Motor in an Elevator System

## What factors do we need to consider when determining the input current of an electric motor used in an elevator system?

We need to consider the efficiency of the motor and the input voltage and power delivered by the motor.

## Calculation of Input Current:

The input current of an electric motor used in an elevator system is influenced by the efficiency of the motor, which is 70%. When the motor is delivering 68 horsepower, the input current is approximately 0.113 A.

## Explanation:

The efficiency of the electric motor is crucial in determining the input current. An efficiency of 70% means that 70% of the input power is converted into useful output power, while the remaining 30% is lost as heat or other forms of energy.

In this scenario, the input voltage is 861 volts and the power delivered by the motor is 68 horsepower. To calculate the input current, we use the formula:

**Input Power = Input Voltage × Input Current**

With the given values and efficiency of 70%, we derive the input current as approximately 0.113 A when the motor is delivering 68 horsepower.