Planning and Prior Knowledge
Aim
To find out the effect that the length of a wire has on its resistance.
What is resistance?
A resistance is anything found in an electrical circuit that oppose (slows down) the flow of the electrons. Resistance also causes some loss of electrical energy when the electrical energy is turning to heat.
In a wire, the atoms (ions) of the metals slow down the electron
This diagram is shows that the electrons are finding it hard to reach the other end of the wire because they are colliding with ions, which causes friction and slows electrons down..
Measuring Resistance.
Resistance are measured in Ohms (Ω).
The measurement of the resistance is followed by the Ohm’s law. The Ohm’s law was invented by a man named George Ohm in 1827. He invented it after an experiment
The Ohm’s law states:-
I= V÷R
I= Current V=Voltage......
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