Physics

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}

5\;\text{W}

2.5\;\text{W}

1\;\text{W}