A voltmeter is attached to the two terminals of a used battery of unknown intern

Question

A voltmeter is attached to the two terminals of a used battery of unknown internal resistance. Without other connections, the voltage reading is 9V. When an external resistor R=400 ohms is connected to the terminals of the battery, the voltage reading becomes 6V.

a) Determine the current in the circuit.

b) Determine the internal resistance of the battery.

c) What will the voltage reading be when the eternal resistor is replaced by another one of 700 ohms.

d) How much electrical energy is consumed on the R=700 ohms resistor during 5 hours?

Explanation / Answer

a.15 mA b.200 ohms c.7 volts d.1260 J

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