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Physics Coursework: Electrical Resistance Aim: The aim of this investigation is to find out if the length of an electrical resistor (graphite putty) affects its resistance. Prediction: An electrical current is the movement of electrons through a substance. Resistance occurs when the electrons travelling through the substance collide with the atoms of the substance. This collision slows down the flow of electrons causing resistance. Resistance is the measurement of how hard it is for electrons to move through a substance. The resistance of a substance is measured in Ohms (?), which can be shown in the formula: Voltage Resistance = --------------- (Equation 1) Current All substances have a resistance, the more resistance a substance has the less current gets through. The resistance of a substance can be altered by factors which include: * Temperature Heat energy gives the atoms of the resistor more energy causing them to vibrate. This results in more collisions between the passing electrons and the atoms...

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