This homemade galvanometer is not a quantifiable measure of current it does not measure volts as a voltmeter would. Does it make a difference in the amount of deflection or in how fast the compass needle moves? Does it make a difference if you have a moving coil? Try coiling your wire tighter, or make more coils around the compass. If you change the direction of the current (by turning the battery around so the negative terminal will connect to the other end of the wire), then you should also be able to see a change in the direction that the compass needle moves. The current flowing through the circuit produces an electromagnetic field, like the Earth's magnetic field, which makes the magnetized compass needle try to align with it as the current moves through the circuit.
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