Electric Circuit

Electric Circuit

Electric circuit is a complete path which charges can flow from one terminal of electric source to another terminal. It can be represented by a simple circuit diagram with electric symbols.
Four main components
  • Electric Source (like cell): a source of e.m.f that drives charges round the circuit
  • Switch: to open or close the circuit
  • Load (like bulb) which moving charges can do a useful job on it
  • Wires (copper wire) to connect the components together

Types of Electric Circuit

(1) Closed Circuit

All electric components are connected together with wires and switch is closed to allow the current from flowing through the components.
(2) Open Circuit
There is a break in the circuit such that current is not flowing through the component.

Many reasons
  • Missing wire in the circuit
  • Switch is open
  • Component is not connected properly i.e. loosed.
  • and etc
(3) Short Circuit

A wire acts as an alternative path for current to flow through as it has a lower resistance. Hence, the current will pass through the wire instead of bulb. No current passing through the bulb! 
Short circuit is very dangerous. This will be discussed at Practical Electricity.
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