Actions of Current

Current flow has the following effects; motion, light or heat generation, chemical reaction, and electromagnetism.
1- HEAT GENERATION
When current flows through a lamp filament, defroster grid, or cigarette lighter, heat is generated by changing electrical energy to thermal energy. Fuses melt from the heat generated when too much current flows.
2- CHEMICAL REACTION
In a simple battery, a chemical reaction between two different metals and a mixture of acid and water causes a potential energy, or voltage. When the battery is connected to an external load, current will flow. The current will continue flowing until the two metals become similar and the mixture becomes mostly water.
When current is sent into the battery by an alternator or a battery charger, however, the reaction is reversed. This is a chemical reaction caused by current flow. The current causes an electrochemical reaction that restores the metals and the acid-water mixture.
3- ELECTROMAGNETISM Electricity and magnetism are closely related. Magnetism can be used to produce electricity. And, electricity can be used to produce magnetism.
All conductors carrying current create a magnetic field. The magnetic field strength is changed by changing current stronger field means (more current), weaker field means (less current).


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