Simple electrical circuit

 Simple Electric Circuit 

A simple electrical circuit is one in which the current flows from the source to a load and reaches back the source to complete the path. As shown in Fig, the electrical circuit should consist of the following. 

• An energy source (cell) to provide the voltage needed to force the current through the circuit. 

• Conductors through which the current can flow. 

• A load (resistor ‘R’) to control the amount of current and to convert the electrical energy to other forms. 

• A control device (switch ‘S’) to start or stop the flow of current.

In addition to the above, the circuit may have insulators (PVC or rubber) to confine the current to the desired path, and a protection device (fuse ‘F’) to interrupt the circuit in case of malfunction of the circuit (excess current).