A short presentation on electric circuits

1. Components of a Circuit
Compiled by Mr S NONTSHIKIZA

2. LESSON OUTCOMES
• By the end of the lesson learners should be able to :
Identify the different components of circuits.
Build electric circuits.
Demonstrate commitment to environmental welfare (Waste
disposal).

3. INTRODUCTION
• When electricity has been generated, it needs to be
transported to where it will be used e.g house.
• This transportation is made possible by – electric
cirucits.
• Electric circuit- is a system of electrical components
that transport electric current.
• Electric current – is a stream of charged particles e.g
electrons, moving through an electrical conductor.

4. COMPONENTS OF A CIRCUIT
• A circuit is made up of the following components :
Battery
Conductor
Switch
Resistor
Bulb

5. BATTERY

6. • A battery is the MAIN source of electric energy.
• It stores energy as potential energy.
• When connected to a circuit, the potential energy is
turned to electric energy and kinetic energy.
• What does the kinetic energy do in the circuit?

7. CONDUCTOR
• Material that allows electric charges to
pass through it.
• Most metals like copper are good
conductors, however nonmetals are not
good conductors.
• Poor conductors are called insulators.

8. SWITCH

9. RESISTOR
• A resistor is an electrical component that
opposes the flow of electricity.
• It can also convert electrical energy to
heat or light.
• Why do we need resistors?
• Resistors control how much electricity
flows into components such as bulbs.

10. BULB
• A bulb is an air-tight glass element with a filament that glows when
connected to electricity.
• Bulb converts electric current into light and heat energy.
• Resistance to electron flow in the filament causes a bulb to glow.

11. Component Function Symbol
Electrical wire A substance which allows electric
charge to move through it.
Resistor A component that opposes or
inhibits electrical current in a circuit.
It can also convert electrical energy
to heat or light.
Cell
Bulb
Open switch
Closed switch

12. Component Function Symbol
Electrical wire A substance which allows electric charge to
move through it.
Resistor A component that opposes or inhibits
electrical current in a circuit. It can also
convert electrical energy to heat or light.
Cell A source of energy for an electric circuit.
Bulb A circuit component with a filament that
resists the flow of electricity releasing a
glowing light.
Open switch Stops the flow of electricity in a circuit.
Closed switch Allows electricity to flow in a circuit.

13. HAVE SOME FUN WITH CIRCUITS
• Play this game to test your understanding.
• https://www.andythelwell.com/blobz/guide.html