unit 4 standard no:23 lesson 2
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UNIT 4 Standard No:23 LESSON 2. ELECRICITY. types of circuits. Series Circuit. Parallel Circuit. Ammeter. جهاز قياس شدة التيار. Voltmeter. جهازقياس الجهد الكهربائي. Series Circuit. دارة متسلسلة. Parallel Circuit. دارة متوازية. There are 2 types of circuits. Parallel Circuit. - PowerPoint PPT PresentationTRANSCRIPT
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UNIT 4Standard No:23
LESSON 2
ELECRICITY
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types of circuits
Series CircuitParallel Circuit
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Ammet
erVoltmeter الجهد جهازقياس
الكهربائي
التيار شدة جهازقياس
Series Circuit
Parallel Circuit متوازية دارة
متسلسلة دارة
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There are 2 types of circuits
Series Circuit Parallel Circuit
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Series CircuitSeries Circuit: the components are lined up along one path. If the circuit is broken, all components turn off.
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Parallel CircuitParallel Circuit – there are several branching paths to the components. If the circuit is broken at any one branch, only the components on that branch will turn off.
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There are 2 types of circuits
Series Circuit Parallel Circuit
Series Circuit: the components are lined up along one path. If the circuit is broken, all components turn off.
Parallel Circuit – there are several branching paths to the components. If the circuit is broken at any one branch, only the components on that branch will turn off
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Series circuit
In series circuit with two lamps, if one breaks the other goes out, too
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Parallel circuits
In a parallel circuit with lamps on separate wires, if one breaks the other stays lit
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measuring currentElectric current is measured by sing an……………………….. connected
in .................... in the circuit.
Activity:1- Use the items you have and make complete circuit 2- Add the ammeter to the circuit .3- Did the reading in the ammeter change? ……….
A A
The number of electrons moving through a circuit.
The electrons carry electrical energy.
Electric current :
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SERIES CIRCUIT• current is the same at all points in the circuit.
measuring current
2A 2A
2A
PARALLEL CIRCUIT• current is shared between the components
2A2A
1.5A
0.5A
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Electric current :
The number of electrons moving through a circuit.The electrons carry electrical energy.
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measuring potential differencePotential difference is measured by sing a……………………….. connected
in .................... in the circuit.
Activity:1- Use the items you have and make complete circuit 2- Add the Voltmeter to the circuit .3- Did the reading in the voltmeter change? ……….
V
V
Potential difference :It is the difference in electrical energy between two parts of a circuit, measured in Volts.It is provided by a source (battery) which causes the current to move through the circuit.
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measuring potential difference
SERIES CIRCUIT
PARALLEL CIRCUITvoltage is the same
in all parts of the circuit.3V
3V
3V
voltage is shared between the components
2V 1V
3V
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(Potential Difference (voltage
It is the difference in electrical energy between two parts of a circuit.It is provided by a source (battery) which causes the current to move through the circuit.
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Activity1
V V
6V4A
A
Aa)
V
V
6V4A A
A
A
b)
Write the missing numbers of volts and ampere:
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ACTIVITY 2:Use the table below to draw a graph between the current and the potential difference.
10 8 6 4 Potential difference
8 6 4 2 current
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potential differences
current
0 2 4 6 8 10 12
10
8
6
4
2
Direct proportion طردية عالقة
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potential differences
current R=
R depends over the wire so it was called Resistance and it’s measurement unit is ohm Ω
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Ohm’s law :
In electrical circuits, Ohm's law states that the current through a conductor between two points is directly proportional to the potential difference across the two points, and inversely proportional to the resistance between them.
R I
V
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Georg Simon Ohm (16 March 1789 – 6 July 1854) was a German physicist. As a high school teacher, Ohm began his research with the recently invented electrochemical cell, invented by Italian Count Alessandro Volta. Using equipment of his own creation, Ohm determined that there is a direct proportionality between the potential difference (voltage) applied across a conductor and the resultant electric current – now known as Ohm's law.
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R I
V
What is the amount of current (I) in this circuit?
V
V
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What is the amount of resistance (R) offered by the lamp?
V
V
R I
V
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So Ohm was named after the scientist
Home workFind out where did the words volt and ampere came from ?
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Adding resistances in series
•Each resistance in a series circuit adds to the total resistance of the circuit.
Rtotal = R1 + R2 + R3...Total
resistance(ohms) Individual resistances
(Ω)
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Open physics for you pg:208 -209 and try to solve
problemsExample 1 and 2
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ACTIVITY :The flow of electrical charge
around a circuit is called the …a) raisin.b) battery.c) current.
The symbol represents which electrical component ?
a) A switch.b) A bulb.
c) An ammeter
Review
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ACTIVITY :Look at each diagram below, If you think the bulb or bulbs will light, put a tick in the box. If you do not think the bulb or bulbs will light, put
a cross in the box:-
Review
A
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End of lesson2