Electricity & Heat (Edexcel IGCSE Physics (Modular))
Revision Note
Written by: Katie M
Reviewed by: Caroline Carroll
Electricity & heat
A current passing through a resistor (or wire) results in the electrical transfer of energy
As explained in Charge & current, current is the rate of flow of charge
The temperature of a resistor increases due to the collisions of the free electrons within the wire
Some of the energy is dissipated into the surroundings by heating
This heating effect is utilised in many domestic contexts, including:
Electric heaters
Electric ovens
Electric hob
Toasters
Kettles
Heating a pan on an electrical hob
The heating effect of current can be used for many applications such as electric hobs
Examiner Tips and Tricks
Remember that a charge moving around an electrical circuit are an example of an electrical transfer pathway. If you are unsure of how to explain energy stores and transfers use the Energy stores & transfers revision note to help.
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