I am going to investigate how the resistance of the wire affects a current flowing through a wire. I know that as resistance changes, current changes, as Ohm’s law:
I = V/R. If one part of an equation changes, the equal must be done to the opposite side. To detect how resistance affects current, I must first discover what factors affect resistance. These factors are:
· Length of the wire – if a wire is longer; there are more particles for electrons to move through, and therefore more resistance.
· Conductivity – depending on the metal of which the wire is made there will be less/more resistance.
· Temperature – many metals’ resistance changes as temperature increases, that is why we use constantan wires.
· Diameter/Cross sectional area – if a wire has a larger diameter, then the particles have more room to flow.
I shall investigate what affect the diameter of a wire has on its resistance, and consequentially the current of the circuit. I shall keep the other variables......
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