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Describe how you would investigate the properties of a piece of wire so as to enable an electrician to make a resistor of the required value.
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Physics Coursework The Problem In catalogues such as R.S components, Malpin, Cpc etc resistors are listed with certain fixed values, e.g.) 47?. While repairing an old piece of electrical/electronic equipment an electrician discovered that he needed to replace a resistor with a value not listed in any of the catalogues. Describe how you would investigate the properties of a piece of wire so as to enable him to make a resistor of the required value. Background Knowledge. To carry out an investigation dealing with resistance and electricity, we firstly need to know about what resistance is. The resistance is the opposition of a conductor to current. It occurs when electrons travelling along the wire collide with the ions in the wire. It could also be described as a measure of how hard it is to move the electrons/ions through a wire. The current is the rate of the flow of charge and the voltage is the...
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