A non-ohmic device has an – curve in which current is plotted on the vertical axis…

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

Problem

A non-ohmic device has an

I

–

V

curve in which current

I

is plotted on the vertical axis against voltage

V

on the horizontal axis. At

V = 5\,\text{V}

the tangent to the curve has a slope of

0.20\,\text{A}\,\text{V}^{-1}

. Estimate the power being dissipated by the device at this point. (a)

25\;\text{W}

(b)

5\;\text{W}

(c)

2.5\;\text{W}

(d)

1\;\text{W}