To investigate the variation of current (I) with P.D. (V) for (c) copper sulfate solution with copper Electrodes

Apparatus

Replace the filament bulb in the circuit with copper electrodes in copper sulfate solution.

Circuit diagram with copper electrodes in copper sulfate solution

Procedure

Adjust the potential divider to obtain different values for the voltage V and hence for the current I.
Obtain at least ten values for V and I using the voltmeter and the milliammeter.
Plot a graph of I against V.

To investigate the variation of current (I) with P.D. (V) for (c) copper sulfate solution with copper Electrodes

Results

V/V	0.0	0.5	1.0	1.5	2.0	2.5	3.0	3.5	4.0	4.5
I/mA

Conclusion

A straight line through the origin ⇒ I ∝ V

Notes

infoNote

The copper sulfate solution may be made by adding 15 g of copper sulfate to 100 cm³ of warm water. Adding 2 cm³ of concentrated sulphuric acid ensures that the solution stays clear and this will enable it to be reused a number of times.

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