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.

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UNIT 4 Standard No:23 LESSON 2

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Unit 4 standard no 23 lesson 2

UNIT 4

Standard No:23

LESSON 2

ELECRICITY


Unit 4 standard no 23 lesson 2

types of circuits

Series Circuit

Parallel Circuit


Unit 4 standard no 23 lesson 2

Ammeter

جهازقياس شدة التيار

Voltmeter

جهازقياس الجهد الكهربائي

Series Circuit

دارة متسلسلة

Parallel Circuit

دارة متوازية


Unit 4 standard no 23 lesson 2

There are 2 types of circuits

Parallel Circuit

Series Circuit


Series circuit

Series Circuit

Series Circuit: the components are lined up along one path.

If the circuit is broken, all components turn off.


Parallel circuit

Parallel Circuit

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.


Unit 4 standard no 23 lesson 2

There are 2 types of circuits

Parallel Circuit

Series Circuit

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

Series Circuit: the components are lined up along one path.

If the circuit is broken,

all components turn off.


Unit 4 standard no 23 lesson 2

Series circuit

  • In series circuit with two lamps, if one breaks the other goes out, too


Unit 4 standard no 23 lesson 2

Parallel circuits

In a parallel circuit with lamps on separate wires, if one breaks the other stays lit


Unit 4 standard no 23 lesson 2

measuring current

Electric 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

Electric current :

A

The number of electrons

moving through a circuit.

The electrons carry electrical energy.


Unit 4 standard no 23 lesson 2

measuring current

SERIES CIRCUIT

  • current is the same

  • at all points in the

  • circuit.

2A

2A

2A

PARALLEL CIRCUIT

2A

2A

  • current is shared

  • between the

  • components

1.5A

0.5A


Unit 4 standard no 23 lesson 2

Electric current :

The number of electrons moving through a circuit.

The electrons carry electrical energy.


Unit 4 standard no 23 lesson 2

measuring potential difference

Potential 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

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.

V


Unit 4 standard no 23 lesson 2

measuring potential difference

SERIES CIRCUIT

voltage is shared

between the components

3V

3V

3V

PARALLEL CIRCUIT

voltage is the same

in all parts of the circuit.

1V

2V

3V


Unit 4 standard no 23 lesson 2

(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.


Unit 4 standard no 23 lesson 2

Activity1

Write the missing numbers of volts and ampere:

a)

6V

4A

A

V

V

A

b)

6V

4A

A

V

A

V

A


Unit 4 standard no 23 lesson 2

ACTIVITY 2:

Use the table below to draw a graph between the current and the potential difference.


Unit 4 standard no 23 lesson 2

10

8

6

4

2

potential differences

current

0 2 4 6 8 10 12

Direct proportion علاقة طردية


Unit 4 standard no 23 lesson 2

potential differences

R =

current

R depends over the wire so it was called Resistance and it’s measurement unit is ohm Ω


Unit 4 standard no 23 lesson 2

Ohm’s law :

V

I

R

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.


Unit 4 standard no 23 lesson 2

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.


Unit 4 standard no 23 lesson 2

V

I

R

V

What is the amount of current (I) in this circuit?

V


Unit 4 standard no 23 lesson 2

V

I

R

V

What is the amount of resistance (R) offered by the lamp?

V


Unit 4 standard no 23 lesson 2

So Ohm was named after the scientist

Home work

Find out where did the words volt and ampere came from ?


Unit 4 standard no 23 lesson 2

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)


Unit 4 standard no 23 lesson 2

Open physics for you pg:208 -209 and try to solve problems

Example 1 and 2


Unit 4 standard no 23 lesson 2

Review

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


Unit 4 standard no 23 lesson 2

Review

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:-

A


Unit 4 standard no 23 lesson 2

End of lesson2


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