Physics

Problem

Four devices have the following current–voltage relations: P:

V = 4I

V = 3I + 2

V = 5I^{2}

I = V + 0.5V^{2}

Which device can be regarded as ohmic over the range tested? a)

Q\text{ only}

P \text{ and } Q

P\text{ only}

R\text{ only}