The circuit of Figure P2.72 is used to measure the internal impedance of a battery. The battery being tested is a NiMH battery cell.

a. A fresh battery is being tested, and it is found that the voltage vout is 2.28 V with the switch open and 2.27 V with the switch closed. Find the internal resistance of the battery.

b. The same battery is tested one year later. vout is found to be 2.2 V with the switch open but 0.31 V with the switch closed. Find the internal resistance of the battery.


Known quantities:

Schematic of the circuit shown in Figure P2.72; voltage at terminals with switch open and closed for fresh battery; same voltages for the same battery after 1 year.

Find:

The internal resistance of the battery in each case.



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