Question

In the circuit diagram shown below, what is the
reading of ideal Ammeter (A)?
30
W
3 Ω
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JEE Fou
(A
2 Ω
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6 Ω
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12 V​

Answer 1

Explanation:

ANSWER

Looking at the loop with first two resistors, we can say that current in the two resistors will be equal and opposite. Similarly, in the loop with last two resistors, current will be equal and opposite.

L: Left, R: Right

In first resistor, i flows L to R.

In second resistor, i flows R to L.

In third resistor, i flows L to R.

Therefore, current in ammeter will be 3i R to L. Hence, applyin KVL,

4=(3i)(1)+(i)(9)

i=

3

1

A

Therefore, ammeter reading will be 3i=3X

3

1

A=1A.

And voltmeter reading will be V=iR=9X

3

1

V=3V.