5.EFFECTS OF ELECTRIC CURRENT:

5.1.HEAT:
The energy that an electric current produces as heat is called the joule effect.It is expressed by the following formula:
E= I2*R*t.


5.2.LIGHT:
There are various ways that electricy can be used to produce light.

Incandescent bulbs:When an electric current passes through the metallic filament of a light bulb,it produces light.The phenomenon is called incandescence.

Fluorescent tubes:Inside a fluorescent tube,there is a metallic filament,normally made of tungsten.There is also an inert gas,such as argon,and a small amount of mercury. When an electric current passes through the filament,electrons are emitted into the inert gas.

Light-emitting diodes:A light-emitting diode has layers of semiconductor materials.












5.3.ELECTROMAGNETIC EFFECTS:
In this experiment,the electric circuit has created a magnetic field.This effect can be used to produce movement.
The scientist Michael Faraday discovered to opposite effect.He noticed that electricity could be generated by using a manget and an electrical conductor.This principle allows us to build dynamos and alternators.













5.4.SOUND:
We can transform electric current into sound by using electromechanical devides,such as bells and buzzers.Some of these devides are based on the piezoelectric effect,or the ability of some materials to change when electricy is applied to them.