You illuminate a photovoltaic cell with a halogen light bulb. The cell is connected to an ammeter, a voltmeter, and a variable resistor (Figure P31.102a), and the current through and potential difference across the resistor are measured for different settings of the resistor. Figure P31.102 \(b\) shows the data from these measurements.

Data from Figure P31.102

where each data point represents the potential difference and current at a particular value of \(R_{\mathrm{var}}\). What values of \(R_{\text {var }}\) do the data points at low and high potential differences correspond to? When is the power of the photovoltaic cell at its maximum value?

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(a) photovoltaic cell A (b) 1.2 1.0 current (mA) V Rvar 0.8 0.6 0.4 0.2 0 0 1 2 3 4 5 potential difference (V) 6 7