In another sample

PHYSICS · Single correct · A Level · Physics · Electricity · Electricity

Problem

In another sample, the current becomes

2\,\text{A}

when the applied voltage is

2\,\text{V}

, but only

3\,\text{A}

when the voltage is raised to

6\,\text{V}

(temperature is constant). Which statement is correct? (a) The sample obeys Ohm’s law; the resistance remains

1\,\Omega

(b) The sample is non-ohmic; resistance increases as voltage increases (c) The sample is non-ohmic; resistance decreases as voltage increases (d) The sample becomes superconducting at higher voltages; resistance tends to zero

Related theory

Ohm's Law (Macroscopic)
Ohm's law, V-I graphs and ohmic/non-ohmic conductors
Current Electricity
Ohm's law and V-I graphs
Electricity
Ohm's law and its limitations

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