Effects of Electricity
Electric current has three effects: heating, chemical and magnetic.
|Heating: 'The heating effect of electric current is used in many everyday devices. Electric cookers, kettles and toasters are among the household appliances that rely on it.|
Joule’s Law states that the rate at which heat is produced in a resistor is proportional to the square of the current flowing through it, if the resistance is constant
|Chemical: Passing an electric current through a liquid causes chemical changes in a process called electrolysis.|
Electroplating uses electrolysis to put a layer of one metal on top of another. Examples include chromium plating of bathroom and car parts, and silver plating of cutlery and jewellery.
|Magnetic Electric current passing through a wire generates a magnetic field around the wire.|
This effect is used in all sorts of ways. Examples include electric motors and electromagnets. In a car, for example, the central locking uses electromagnets called solenoids to operate the lock mechanism.
Another widespread example is the loudspeaker, where variations in the magnetic effect of an electric current are translated into sound waves that we can hear.
Next: Learn It - Heating Effect and Joule's Law
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