1. Objective
Students will be able to compare series and parallel circuits in order to describe how energy is transferred to produce light

3. ELECTRICAL CIRCUITS S.MORRIS 2006
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4. What is an electric current?
An electric current is a flow of electrons flowing through wires and components. - +
In which direction does the current flow?
from the Negative terminal to the Positive terminal of a cell.

5. simple circuits
Here is a simple electric circuit. It has an energy source, a load and a switch.
wires
Energy Source
Load
switch
To make the circuit, these components are connected together with metal connecting wires.

6. simple circuits
When the switch is closed, the lamp lights up. This is because there is a continuous path of metal for the electric current to flow around.
If there were any breaks in the circuit, the current could not flow.

7. types of circuit There are two types of electrical circuits;
SERIES CIRCUITS
PARALLEL CIRCUITS

8. SERIES CIRCUITS
A Series Circuit is a circuit in which all parts are connected in a single loop.
There is only one path for charges to follow, so the charges must flow through each part of the circuit.
If one bulb ‘blows’ it breaks the whole circuit and all the bulbs go out.

9. Series
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10. Series
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11. Series
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12. Series
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13. Series
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14. Series
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Open Circuit!!

15. PARALLEL CIRCUITS
A Parallel Circuit is a circuit in which loads are connected side by side.
The charges have more than one path in which they can travel
If one bulb ‘blows’ there is still a complete circuit to the other bulb so it stays alight.

16. Parallel

17. Parallel
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18. Parallel
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19. Parallel
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20. Parallel
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21. Parallel
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22. Parallel
Two Complete
Circuits
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23. Comparison Series Circuit Parallel Circuit Definition Resistance
Examples
Only one path for current to flow
Multiple paths for current to flow
Total resistance increases
Total resistance stays same
Holiday lights
-Household Current