Magnetism and electricity.
*The electric current generates a magnetic effect .
As the idea of making the electromagnet
it converts the electric energy into magnetic energy
* When electric current passes through the coil winding around wrought iron bar becomes a temporary magnet
The electromagnet : - It is the magnet which is made by electricity.
• Its structure:
- It is made up of a copper wire coiling around a bar of wrought iron connected to a battery.
*The magnetic force of the electromagnet can be increased by:
a. increasing the number of coil turns.
B. increasing the number of batteries
• Uses of the electromagnet:
The electromagnet is used in:
1. Factories, to lift the heavy iron blocks as it is used for making crane
2. Making many appliances as
a. The electric bell.
c. The disc drive.
b. The electric mixer.
d. The television.
The electric effect of the magnet
the English scientist Faraday discovered that:
• When a magnet is moved inside a coil of wire, an electric current passes through the coil
• This means that the electric energy can be generated by a magnetic energy
• Farady used this discovery to make an electric generator known as “the dynamo”
The electric generator (the dynamo)
It converts the mechanical (kinetic) energy into electrical energy.
Its Structure
1. copper coil. 2. A magnet.
There are many examples on dynamo.
1-small dynamo for lightening of the bicycle’s bulb.
2- huge dynamo : It is used in electric power stations to generate large amount of electricity used for lightening cities and operating factories.
*to increase the produced amount of electricity from the dynamo
1. By using a strong magnet.
2. By increasing the number of turns in the moving coils
5- When an electric current flows through a wire twisted (winding) around a wrought iron nail, the nail becomes an …..
7-The electromagnet consists of ………and……….
16- When you move a coil between two poles of a magnet…….. is generated in the coil.
17- The basic idea of the electric generator is the changing of…… energy into……. energy
The apparatus that converts the kinetic energy into electrical energy is called …….. .
The electricity from the dynamo increase by …………… or …………..
* an electric current is generated in a coil of insulated wire when you move an ……. Bar inside the coil .
Write scientific term:
A set converts the mechanical (kinetic) energy into electrical energy.
Choose
18. The electric generator (dynamo) works on changing the
a. kinetic energy into electric energy.
b. electric energy into mechanical energy.
c. magnetic energy into mechanical energy.
d. electric energy into magnetic energy.
19. The coil of a dynamo is made up of wire.
a. carbon b. copper c. plastic d. graphite
20. The dynamo is fixed in the bicycle touching the bicycle’s
a. seat . b. pedal. c. tire. d. gear.
Put (√) in front of the correct statement and (x) in front of the incorrect ones and correct it:
2. The electromagnet consists of an iron bar and a coil only.
*The electric current generates a magnetic effect .
As the idea of making the electromagnet
it converts the electric energy into magnetic energy
* When electric current passes through the coil winding around wrought iron bar becomes a temporary magnet
The electromagnet : - It is the magnet which is made by electricity.
• Its structure:
- It is made up of a copper wire coiling around a bar of wrought iron connected to a battery.
*The magnetic force of the electromagnet can be increased by:
a. increasing the number of coil turns.
B. increasing the number of batteries
• Uses of the electromagnet:
The electromagnet is used in:
1. Factories, to lift the heavy iron blocks as it is used for making crane
2. Making many appliances as
a. The electric bell.
c. The disc drive.
b. The electric mixer.
d. The television.
The electric effect of the magnet
the English scientist Faraday discovered that:
• When a magnet is moved inside a coil of wire, an electric current passes through the coil
• This means that the electric energy can be generated by a magnetic energy
• Farady used this discovery to make an electric generator known as “the dynamo”
The electric generator (the dynamo)
It converts the mechanical (kinetic) energy into electrical energy.
Its Structure
1. copper coil. 2. A magnet.
There are many examples on dynamo.
1-small dynamo for lightening of the bicycle’s bulb.
2- huge dynamo : It is used in electric power stations to generate large amount of electricity used for lightening cities and operating factories.
*to increase the produced amount of electricity from the dynamo
1. By using a strong magnet.
2. By increasing the number of turns in the moving coils
5- When an electric current flows through a wire twisted (winding) around a wrought iron nail, the nail becomes an …..
7-The electromagnet consists of ………and……….
16- When you move a coil between two poles of a magnet…….. is generated in the coil.
17- The basic idea of the electric generator is the changing of…… energy into……. energy
The apparatus that converts the kinetic energy into electrical energy is called …….. .
The electricity from the dynamo increase by …………… or …………..
* an electric current is generated in a coil of insulated wire when you move an ……. Bar inside the coil .
Write scientific term:
A set converts the mechanical (kinetic) energy into electrical energy.
Choose
18. The electric generator (dynamo) works on changing the
a. kinetic energy into electric energy.
b. electric energy into mechanical energy.
c. magnetic energy into mechanical energy.
d. electric energy into magnetic energy.
19. The coil of a dynamo is made up of wire.
a. carbon b. copper c. plastic d. graphite
20. The dynamo is fixed in the bicycle touching the bicycle’s
a. seat . b. pedal. c. tire. d. gear.
Put (√) in front of the correct statement and (x) in front of the incorrect ones and correct it:
2. The electromagnet consists of an iron bar and a coil only.
