March 9, 2017

State the main effects of electric current? What are the applications of it?


The three main effects of an electric current are:

  1. Magnetic effect
  2. Chemical effect and
  3. Heating effect.

Some practical applications of the effects of an electric current include:

Magnetic effect: 

When electric current flows through a wire, it behaves like a magnet. This is called magnetic effect of electric current.

Figure 1: Electric bell - examples of magnetic effect.

Applications of magnetic effect:

  • Bells
  • Relays
  • Motors
  • Generators
  • Transformers
  • Telephones
  • Car-ignition and 
  • Lifting magnets.

Chemical effect: 

The passage of an electric current through a conducting liquid causes chemical reactions. The resulting effects are called chemical effects of electric current.
Figure 2: Battery - Example of chemecal effect.

Applications of chemical effect:

  • Primary and secondary cells and 
  • Electroplating.

Heating effect:  

When electric current flows through a wire, the wire gets heated. This is called the heating effect of electric current.

Figure 3: Irons - example of heating effects.

Applications of heating effect:

  • Cookers
  • Water heaters
  • Electric fires
  • Irons
  • Furnaces
  • Kettles and 
  • Soldering irons

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