What is the Hopkinson Test?The Hopkinson test definitionThe Hopkinson test is a useful method to test the efficiency of DC motors. It requires two identical machines, one acting as a generator and the other as a motor. The generator provides mechanical power to the motor, which then drives the generator. This setup is why the Hopkinson test is also known as back-to-back or regenerative testing.If there is no loss, no external power supply is required. However, since the generator output voltage