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f-alpha.net » Physics » Electricity » Battery » Let's go... » Experiment 6 - Real Battery

Experiment 6 - The Real Battery

Measure the voltage across the load resistor. Contrast this with the voltage of the battery without load resistor.

Measuring the voltage of 9 volts battery with without load. (Enlarge)

Measuring the voltage across the load resistor. (Enlarge)

Circuit diagram measuring the voltage of 9 volts battery with without load.

Circuit diagram measuring the voltage across the load resistor.

The voltage of the battery without load is 9 V. In the load circuit however you measure a voltage at the load resistance of only 8 V.

Somewhere in the circuit a voltage of 1 V is applied. From the experiment 4 you know, that a current of 0.8 A flows in the circuit. According to Ohm's law the "hidden" resistance is of a value of...

Ri = Ui / I = 1 V / 0.8 A = 1.2 Ω

This resistance can reside only in the battery...

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