Motors and generators Flashcards
Define direct current motors
Convert electrical energy to mechanical energy in the form of rotation and it has a battery
Define an alternating current motor
It needs a power source and it’s named for the type of current it supplies
Why does a d.c motor have a split ring commutator?
The split ring commutator alternates current in the coil every half term
What is the purpose of the carbon brushes
They are made out of graphite and they maintain electrical current and contact
What are three improvements that can be made on a motor
- stronger power source
- bigger battery
- increase number of coils
- stronger magnet
What is the purpose of a slip ring commutator
It does not alternate current . It transforms between rotating portions of a machine
What is the energy conversion in a motor
Electrical energy to kinetic energy
Why would Eskom prefer an AC generator.
Less energy is lost through heat production in an ac generator
What is the energy conversion in a generator
Kinetic energy to electrical energy
Define Electromagnetic induction
A changing magnetic field around a conductor induces an emf in a conductor. The magnitude of the induced emf is directly proportional to the rate of change of magnetic flux.
