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Question

An ac ammeter is used to measure current in a circuit. When a given direct current passes through the circuit, the ac ammeter reads $$3\space A$$. When another alternating current passes through the circuit, the ac ammeter reads $$4\space A$$. Then find the reading of this ammeter (in A), if dc and ac flow through the circuit simultaneously.


Solution

Here, $$I=\sqrt{I_{dc}^2+I_{ac}^2}=\sqrt{3^2+4^2}=5  A$$

Thus ammeter reading is $$5  A$$

Physics
NCERT
Standard XII

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