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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apply the formula of restance of r=v/I
resistance is 5ohm
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Resistance of the resistor is 5Ω
Explanation:
Given: Reading in the Voltmeter is 2V. So V = 2
Reading in the Ammeter is 0.4 A. So I = 0.4
According to Ohm’s Law, we know that V = IR
So 2 = 0.4 * R
R = 2/ 0.4 = 5 Ohms.
Resistance of the resistor is 5Ω.
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