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# GCSE Physics Help watch

1. Hello, does anyone know the difference between a motor,generator,dynamo & alternator, as I get confused on how they work.

Any help would be much appreciated

Thank You.
2. (Original post by Sam.T.)
Hello, does anyone know the difference between a motor,generator,dynamo & alternator, as I get confused on how they work.

Any help would be much appreciated

Thank You.
Generator, alternator and dynamo all convert kinetic energy by rotating a coil within a magnetic field to produce current.

A dynamo produces a direct current with the use of a mechanical commutator.

An alternator produces alternating current.

A generator can be either d.c. or a.c. dependent on type

Motors produce rotational kinetic energy from a current flowing through a coil placed in a magnetic field.

Motors can work with either a.c. or d.c. dependent on type.
3. (Original post by uberteknik)
Generator, alternator and dynamo all convert kinetic energy by rotating a coil within a magnetic field to produce current.

A dynamo produces a direct current with the use of a mechanical commutator.

An alternator produces alternating current.

A generator can be either d.c. or a.c. dependent on type

Motors produce rotational kinetic energy from a current flowing through a coil placed in a magnetic field.

Motors can work with either a.c. or d.c. dependent on type.
Thank You, just one Question, What’s the difference between AC and DC,as how does the current suddenly change direction(I know one is alternating and direct)
4. (Original post by Sam.T.)
Thank You, just one Question, What’s the difference between AC and DC,as how does the current suddenly change direction(I know one is alternating and direct)
Direct Current flows in one direction only in a conductor. Batteries are d.c. The voltage polarity is always the same.

Alternating current flows in both directions (back and forth) in a conductor. The voltage polarity alternates.

Take a look at these (ancient) films. They may be old, but they explain the principles very well. Soz.

The second film goes into more detail with motors and generators (useful for A2 level) and does not do a any harm to take them in. You do not need the equations for GCSE.

5. (Original post by uberteknik)
Direct Current flows in one direction only in a conductor. Batteries are d.c. The voltage polarity is always the same.

Alternating current flows in both directions (back and forth) in a conductor. The voltage polarity alternates.

Take a look at these (ancient) films. They may be old, but they explain the principles very well. Soz.

The second film goes into more detail with motors and generators (useful for A2 level) and does not do a any harm to take them in. You do not need the equations for GCSE.

Thank You

It cleared that up

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