Question

in the circuit the voltmeter reads 30v .what is the resistance of the voltmeter

Answer 1

Refer to the attachments.

Now we know the formula

Vₐ - 30 - 300 I +60 = Vₐ

I = (60 -30) / 300

I = 30/300

I = 0.025 A

Also for the I₁

I₁ = V/R

I₁= 30/400

I₁ = 0.075 A

Now I = I₁ + I₂

0.025 = 0.075 + I₂

I₂ = 0.050

Therefore for the resistance across voltmeter

V = I₂ × R

R = 30 /0.025

R = 1200 Ω

Hence the resistance at the voltmeter is 1200

Hope it helps .

Answer 2

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