An emf source of 6.0V is connected to a purely resistive lamp and a current of 2.0 amperes flows through it. All the wires are resistance-free. What is the resistance of the lamp?

8 ohm

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3 ohm

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6 ohm

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5 ohm

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Solution

The correct option is B 3 ohm
Given figure is a graph of current-voltage relationship in a circuit.
The resistance can be calculated by taking the ratio of the voltage to current which given the resistance at that particular point. That is, $R = \frac{V}{I}$ . For a ohmic resistor, the resistance value remains constant throughout.
Thus $R = \frac{6}{2} = 3 Ω$

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