Question

Explain why an ordinary moving coil ammeter used for dc cannot be used to measure ac current

Answer 1

Explanation:

an ordinary moving coil ammeter used of dc cannot be used to measure an alternating current sven if its frequency is low. ... In this case, the deflection is a result of the heat produced which in turn is proportional to the square of the current. Since this is ALWAYS positive for AC and DC, either can be used.