Metals ar good conductors of electrical stream as they re die hard bare electrons that are free to move well-nigh or flow and therefore carry and transfer pushing as a current, Current is the measure, in amperes, of the evaluate of flow of electrical charge through a circuit. All circuits / components have apology making it difficult for charge to flow through, the electrons make galore(postnominal) collisions with the ions as they move through the circuit, in places with low resistance, the electrons move more freely, as they make fewer collisions. apology is a measure of how hard it is to move electrons through a wire. Resistance is a property of an electric circuit or realm of a circuit that transforms electric energy into heat energy in opposing electric current. Resistance involves collisions of the current-carrying charged particles with rigid particles that make up the structure of the conductors.
This diagram shows that the ions of the metal are surrounded by free electrons, the ions can only vibrate about their fixed positions but they are free to move haphazardly from one ion to another. When a battery is attached, as show in the diagram, free electrons are repelled by the negative terminal and attracted to the lordly one. They therefore move in the same direction and current is formed.
The factors affecting resistance are:
- Temperature; when a wire is heated, the atoms in the wire vibrate be private road of their increased energy. This causes more collisions, and collisions slow the rate of flow of electrical charge through the circuit, and so cause more resistance.
- Material; the type of material affects the amount of free electrons which are able to flow through the wire. The more electrons in the material the lower the resistance would be, but if the atoms are in...
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