Chapter-Chapter 3. Electric Circuits and Their Components Science Curiosity class 7 in english Medium CBSE Notes

Chapter 3: Electric Circuits and Their Components

Definitions:

Electric Current: Electric current is the flow of electric charges through a conductor.

Electric Circuit: An electric circuit is a closed path through which electric current flows.

Cell: A cell is a device that provides electrical energy to a circuit.

Battery: A battery is a combination of two or more cells connected together.

Switch: A switch is a device used to open or close a circuit.

Open Circuit: An open circuit is a circuit in which the path is broken and current does not flow.

Closed Circuit: A closed circuit is a circuit in which the path is complete and current flows.

Conductor: A conductor is a material that allows electric current to pass through it.

Insulator: An insulator is a material that does not allow electric current to pass through it.

Heating Effect of Current: The production of heat when electric current flows through a conductor is called heating effect.

Electric Fuse: A fuse is a safety device that protects circuits by breaking them when excess current flows.

Short Circuit: A short circuit occurs when current flows through an unintended path with very low resistance.

Quick Revision Points:

• Electric current flows only in a closed circuit.
• A cell provides electrical energy.
• A battery is made up of multiple cells.
• A switch controls the flow of current.
• Conductors allow current to pass, insulators do not.
• Heating effect produces heat in appliances like heaters and irons.
• Fuse protects devices from excess current.
• Short circuit can cause damage or fire.
• Electric circuits are used in all electrical devices.
• Safety measures are important while using electricity.

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