Experiment 12 - Discharging Battery

In the experiments, you measure two values...

• The voltage U₀ of the battery without a load circuit and
• the current I through the load circuit.

From this you can calculate the internal resistance R_i...

R_i = ( U₀ / I ) - R_L

(Where does this formula come from...?...see Experiment 18 in the section "Know more...")

At the charged battery you measure a voltage U₀ of 9 V.

In a second step you measure a current through the load circuit of I = 0.8 A.

Hence you calculate the internal resistor R_i = 1.2 Ω.

Measuring the voltage U₀ of the battery without a load circuit.

Measurement of the current I in a load circuit.

Circuit for measuring the voltage U₀ of the battery without a load circuit. (Enlarge)

Circuit for measuring the current I in a load circuit. (Enlarge)