<Li> V, motor input voltage (V) </Li> <Li> Φ, machine's total flux (Wb) </Li> <P> The DC motor's counter emf is proportional to the product of the machine's total flux strength and armature speed: </P> <Dl> <Dd> E = k Φ n </Dd> </Dl>

When a dc motor is driven without any load why is the armature current very small