Investigate the resistance of different wires and how at different lengths the voltage increases and decreases.

... The resistance of wire Planning section In the experiment I will be investigating the resistance of different wires and how at different lengths the voltage increases and decreases. Variables and fair test Key factors Reasons given for controlling How I controlled the variable The current must remain the same. If the current isn't the same the results will be affected and they are most likely to decrease if the current is increased and if the current differs for each of set of results it wouldn't be a fair test. We also need to keep the current the same during the experiment because we are not measuring the current. We are investigating the resistance. This is a controlled variable I controlled this variable by using a variable resister to keep the current on the same setting. I will keep the variable resistor at 0.3 amps. To supply the current, we will use a power pack instead of batteries because power packs are more

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