P2 5.1 ELECTRIC CIRCUITS Difference between cell and battery? Difference between an indicator lamp...
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P2 5.1 ELECTRIC CIRCUITS Difference between cell and battery? Difference between an indicator lamp and a bulb? 1 2 3 4 5
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Transcript of P2 5.1 ELECTRIC CIRCUITS Difference between cell and battery? Difference between an indicator lamp...
P2 5.1 ELECTRIC CIRCUITS
Difference between cell and battery?
Difference between an indicator lamp and a bulb?
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Difference between cell and battery?
Difference between an indicator lamp and a bulb?
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SYMBOLS FUNCTION
SYMBOLS
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FUNCTION
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SYMBOLS FUNCTION
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SYMBOLS FUNCTION
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SYMBOLS FUNCTION
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SYMBOLS FUNCTION
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SYMBOLS FUNCTION
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SYMBOLS FUNCTION
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SYMBOLS FUNCTION
Measuring Current
An Ammeter measures the sizeof the c………. .
It measures it in amperes(also called amps or A).
Are these componentsin series or in parallel?
k = ….. A
l = ….. A
m = ….. A
n = ….. A
0 = ….. A
p = ….. A
Bulbs in Series
A
* Bulbs in series are dimly lit
* If one bulb breaks the other goes out
Bulbs in Parallel
A
* Bulbs in parallel are bright
* If one bulb breaks the other stays on
Used in houses and car head lamps Used in some Christmas tree lights
Bulbs in Series
A
* Bulbs in series are dimly lit
* If one bulb breaks the other goes out
Bulbs in Parallel
A
* Bulbs in parallel are bright
* If one bulb breaks the other stays on
Used in houses and car head lamps Used in Christmas tree lights
Bulbs in Series
A
* Bulbs in series are dimly lit
* If one bulb breaks the other goes out
Bulbs in Parallel
A
* Bulbs in parallel are bright
* If one bulb breaks the other stays on
Used in houses and car head lamps Used in some Christmas tree lights
Is a torch circuit series or parallel ?
Measuring currents in circuits
An electric current is the flow of tiny charges called electronsaround a complete circuit.
We measure current in units called amps using an ammeter in series.
Build the following circuits and write down the ammeter reading:
0.4 A
0.2 A 0.2 A
A
1.
A A
A A
2.
A A
3.“Two bulbs in series are dim ”
4. A
A“Two bulbs in parallel are bright ”
5.
A
AMax current =
Min current = A
A
7.
6.
A
30 cm of thin wireA
60 cm of thin wireA
A
M
CURRENT The current flowing through acomponent in a circuit is measured inamperes (A) using an ammeterconnected in series with the component.
3A P
2A
1A
3A
A higher current means a greater flow ofelectrons.
At point P:
Current in at P =
Currents out at P
An experiment to show that current is a moving charge
Sensitive ammeter
Carbon coated ball on nylon thread
Van der Graff
generator
An experiment to show that current is a moving charge
Carbon coated ball on nylon thread
++_
___
The negative charges on the metal plate attract the ball
An experiment to show that current is a moving charge
Carbon coated ball on nylon thread
++_
___
The negative charges on the metal plate attract the ball
__
__
The ball receives negative chargeand is repelled away carrying the charges
across to the other plate
An experiment to show that current is a moving charge
The faster the charges are carried across from one plate to the other the greater the current flows:
Charge = Current X Time
Q = I X T
Coulombs Amps seconds
Charge = Current X Time
Q = I X T
Coulombs Amps seconds
Example: Calculate the amount of charge flowing passed a point in a wirecarrying a current of 5 Amps in 10 minutes.
Q = I X T
Q = 5 x 10 x 60Q = 3000 Coulombs of charge
