Question

The reading of voltmeter in the circuit shown is

Answer 1

[IMG]

The reading of voltmeter has to be found out.

Calculating the equivalent resistance for circuit, since the resistance and voltmeter are in parallel

                   $R_{ eq }=\frac { { R }_{ 1 }{ R }_{ 2 } }{ { R }_{ 1 }+{ R }_{ 2 } }$

                   $=\frac { 40\times 60 }{ 40+60 } =\frac { 2400 }{ 100 }$

                   =24 ohms;

Adding resistance in series total resistance becomes 24+40 = 64

Now I=$\frac { V }{ R }$ putting the values $\frac { 6 }{ 64 }$=0.0937 Ampere;

Now the current across voltmeter = 0.0562 and voltmeter reading thus becomes

                   $0.0562 \times 40 (since I \times R=V)$ = 2.25 V.

Answer 2

Answer:

2.25 A

Explanation:

Trick: while substituting resistance in the last step consider the equivalent resistance of both the 60 ohm resistor and the 40 ohm of the voltmeter.

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