When a high resistance voltmeter is connected directly across a resist

1.	When a high resistance voltmeter is connected directly across a resister its reading is 2 V. An electric cell is sending the current of 0.4A, (measured by an ammeter) in the electric circuit in which a rheostat is also connected to vary the current.Find the resistance of the resister.
Answer» Since the voltmeter reading shows 2V. Thus V = 2. Also, Current send by electric cell = 0.4A Thus I = 0.4A By Ohm’s law V = IR ⇒ 2 = 0.4 × R ⇒ R = \(\frac{2}{0.4}=\frac{20}{4}\) = 5Ω The resistance of the resistor is 5Ω.

When a high resistance voltmeter is connected directly across a resister its reading is 2 V. An electric cell is sending the current of 0.4A, (measured by an ammeter) in the electric circuit in which a rheostat is also connected to vary the current.Find the resistance of the resister.

Answer»

Since the voltmeter reading shows 2V. Thus V = 2.

Also, Current send by electric cell = 0.4A

Thus I = 0.4A

By Ohm’s law V = IR

⇒ 2 = 0.4 × R

⇒ R = \(\frac{2}{0.4}=\frac{20}{4}\) = 5Ω

The resistance of the resistor is 5Ω.

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When a high resistance voltmeter is connected directly across a resister its reading is 2 V. An electric cell is sending the current of 0.4A, (measured by an ammeter) in the electric circuit in which a rheostat is also connected to vary the current.Find the resistance of the resister.

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