•A current carrying wire has a magnetic field around it •A motor moves because of the interaction between the magnetic field due to a current carrying coil and a permanent magnet •Fleming's left hand rule allows you to predict the direction in which a motor turns •A commutator makes sure the motor keeps spinning in the same direction •Motors spin faster when : 1) the magnetic field is stronger. 2) the current is greater. 3) there are more turns on the coil •In a generator a current is induced in a coil of wire when there is a changing magnetic field •The quicker the field changes, the greater the current •Slip rings allow AC to be generated •Brushes are contacts that touch the slip rings and complete the circuit •A transformer changes the size of an AC voltage •Electricity is transmitted at high voltages to reduce the current and hence reduce the energy loss in the overhead power lines
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