THE CLOSED CIRCUIT

•   In application which require the use of current, the components are arranged in the form of circuit.

•   As shown in the figure.

•  

•   For a closed circuit, these  things should always keep in mind.

           (1) There must be a source of voltage. Without applied voltage current can                     not flow.

(2) There must be a complete path of current flow, from one side of the applied voltage   source, through the external circuit, and returning to the other          side of the voltage source.

(3) The current path normally has resistance. The purpose of a resistance in the circuit is either generating heat or limiting the amount of current. 

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