Electric Circuits

22.1 Electric Circuits
An electric circuit is made up of different components.
Which is:

• Energy source
• Wires
• Output device
• Switch

22.2 Circuit Diagram and Symbols
A circuit diagram is a drawing that uses different symbols to represent an actual electric circuit.
Symbols in an electric circuits

circuit diagram

22.3 Series and Parallel Circuits
We can classify electric circuits based on the arrangement of the components in the circuit. Electric circuits are classified into :

• Series Circuit
• Parallel Circuit

Series Circuit
A series circuit is a circuit that has components which are connected such that there is only one path for the electric current to flow through.




Parallel Circuits
A parallel circuit is a circuit that has parts which are connected such that there are more than one path for the electric current to flow through.




22.4 Brightness of a bulb
The brightness of the bulb in the circuit depends on the amount of electric current flowing through it. We can increase or decrease the amount of electric current flowing through the circuit by changing the:

• number of batteries
• number of bulbs
• arrangement of bulbs

Changing the number of batteries
connecting more batteries to the series circuit makes the bulbs light up brighter.
Changing the number of bulbs
connecting another bulb to the series circuit, without changing the number of batteries, can make the bulbs dimmer.
changing the arrangement of bulbs
connecting more batteries to the series circuit makes the bulb light up lighter.