EFFECTS OF ELECTRIC CURRENT

1.Heat
The energy that an electric current produces as heat is called Joule Effect. It is exprssed by the following formula:              E = I(square) x R x t


2.Light
There are various ways that electricity can be used to produced light:

• Incandescent bulbs.When an electric current passes throughthe metallic filament of a light bulb, it produces light.

• Fluorescent tubes. When an electric current passes through the filament, electrons are emitted into the inert gas.

• Light-emitting diodes (LED). When electricity is applied to the LED, the electrons and holes cross over into the active layer, where they combine and produce photons, or particles of light.

3.Electromagnetic effect

Michael Faraday discovered that electricity could be generated by using a magnet and an electrical conductor. This principle allows us to build dynamos and alternators.

4.Sound
We can transform electric current into sound by using electromechanical devices, such as bells and buzzers. Some of these devices are based on the piezoelectric effect.