A device draws at and at

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

Problem

A device draws

0.6\,\text{A}

3\,\text{V}

and

1.2\,\text{A}

7\,\text{V}

. How should this device be classified? (a) Ohmic, because the current nearly doubles when the voltage nearly doubles (b) Non-ohmic, because current is inversely proportional to voltage (c) Non-ohmic, because its resistance is different at the two voltages (d) Ohmic, because the ratio

I/V

is almost constant for the two readings

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
Electric Circuits

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