The+electric+circuit

=The electric circuit=

When an electric circuit is closed, a current flows through it. Some basic components of an electric circuit includes batteries, wires, a load and a switch. Usually, we use the conventional current flow to denote the flow of the current. Moreover, it also denotes the transfer of energy within the circuit. Once again, the electric circuit has to be closed in order for the system to work.

A common lab activity that illustrates the necessity of a complete loop utilizes a battery pack (a collection of D cells), a light bulb, and some connecting wires. The activity involves observing the affect of connecting and disconnecting a wire in a simple arrangement of the battery pack, light bulbs and wires. When all connections are made to the battery pack, the light bulb lights. In fact, the lighting of the bulb occurs immediately after the final connection is made.

Some common symbols to draw a circuit is shown in the diagram below:

For example, a simple circuit with a D.C source and resistor will look like this :