To investigate the variation of current ( I ) with pd ( V ) for a filament bulb When a voltage source is connected across a filament bulb a current flows through the filament causing it to get hot and emit light. In this experiment we investigate how the current flowing through the filament varies with different voltages applied to it.
Draw a graph of current (y-axis) against voltage to find the relationship between them. Note: Start both axes at zero.
Be sure you understand and can explain why current does not continue to increase in a constant manner as voltage is increased.