The circuit model of a dc voltage source is shown in (Figure 1). The following voltage measurements are made at the terminals of the source: (1) With the terminals of the source open, the voltage is measured at 95 mV , and (2) with a 15 M resistor connected to the terminals, the voltage is measured at 85 mV . All measurements are made with a digital voltmeter that has a meter resistance of 14 M