How do you work out Armature current?

Answer 1

To calculate armature current in an electrical machine, you can use the formula: ( I_a = \frac{P_{out} + P_{loss}}{V_{a}} ), where ( I_a ) is the armature current, ( P_{out} ) is the output power, ( P_{loss} ) represents losses (like copper losses and iron losses), and ( V_{a} ) is the armature voltage. Alternatively, if you know the load resistance and applied voltage, you can use Ohm's Law: ( I_a = \frac{V_a}{R} ), where ( R ) is the load resistance. Ensure to account for any back EMF in your calculations for accurate results.