A cell with electromotive force (e.m.f.) $3.0\,\text{V}$ and internal resistance $0.50\,\Omega$ is joined to a variable resistor, a voltmeter and an ammeter, as shown. The resistance of the variable resistor is changed. The ammeter reading $I$ and the voltmeter reading $V$ are noted. Which graph shows the way $V$ changes with $I$?
Physics 9702 · AS & A Level · Potential difference and power