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## PowerPoint Slideshow about ' Magnetism' - tamira

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Try this.

What does the current in the wire do?

Fields

- If you put a ______ in a __________ field, it will experience a force.

Fields

- If you put a ______ in a __________ field, it will experience a force.
- If you put a mass in a gravitational field, it will experience a force.

Fields

- If you put a ______ in a __________ field, it will experience a force.
- If you put a mass in a gravitational field, it will experience a force.
- If you put a charge in an electrical field, it will experience a force.

Fields

- If you put a ______ in a __________ field, it will experience a force.
- If you put a mass in a gravitational field, it will experience a force.
- If you put a charge in an electrical field, it will experience a force.
- If you put a magnetin a magnetic field, it will experience a force.

Oddly enough…

Electrical and magnetic fields can attract and repel.

Gravitational fields seem to only attract

The relationship between electricity and magnetism

A moving charge affects a magnet

A moving magnet affects a charge

The relationship between electricity and magnetism

A moving charge affects a magnet

… it makes a magnetic field

A moving magnet affects a charge

… it makes an electrical field

The relationship between electricity and magnetism

A moving charge affects a magnet

… it makes a magnetic field

A moving magnet affects a charge

… it makes an electrical field

- There is an application of the right hand rule for each of these

The relationship between electricity and magnetism

A stable magnetic field affects a charge…

A stable electrical field affects a magnet…

The relationship between electricity and magnetism

A stable magnetic field affects a charge…

… only if the charge is moving

A stable electrical field affects a magnet…

…only if the magnet is moving

The relationship between electricity and magnetism

A stable magnetic field affects a charge…

… only if the charge is moving

A stable electrical field affects a magnet…

…only if the magnet is moving

- There is an application of the right hand rule for each of these

Electromagnets

- A coil of wire, carrying a current makes a magnetic field.
- If you put the coil around a piece of iron or steel, it becomes an electromagnet.

Electromagnets

- A coil of wire, carrying a current makes a magnetic field.
- If you put the coil around a piece of iron or steel, it becomes an electromagnet.

- Where could you use an electromagnet?

Solenoid

If a magnet can move into and out of the coil, it is called a solenoid.

Solenoid

If a magnet can move into and out of the coil, it is called a solenoid.

- Where could you use a solenoid?

Electric motors

- An electric motor converts electrical energy into work, usually rotational motion.

- Usually, a magnet makes coil of wire rotate when a current is flowing.

Which direction is the force on the wire?

- Use the right hand rule !

Mechanical Energy Electrical Energy

Motors

--Convert electrical energy into mechanical energy

--An electric current causes a coil of wire to spin in a magnetic field

--The rotational motion can do many jobs

Mechanical Energy Electrical Energy

Generators

--Convert mechanical energy into electrical energy

--A coil of wire spinning in a magnetic field causes an electric current

--There are many ways to spin the generator

Mechanical Energy Electrical Energy

Motors

--Convert electrical energy into mechanical energy

--An electric current causes a coil of wire to spin in a magnetic field

--The rotational motion can do many jobs

Generators

--Convert mechanical energy into electrical energy

--A coil of wire spinning in a magnetic field causes an electric current

--There are many ways to spin the generator

Mechanical Energy Electrical Energy

Generator: If you move the wire, the force is exerted on the charge

Motor: If you move the charge (a current), the force is exerted on the wire

- I

- B

- B

- EMF

- Force

- EMF = force on the charge
- =palm

- v = velocity of moving wire =thumb

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