6.16 describe the generation of electricity by the rotation of a magnet within a coil of wire and of a coil of wire within a magnetic field and describe the factors which affect the size of the induced voltage
motion causes the coil inside the magnetic field to turn
as it rotates, the wires cut through the magnetic field lines, and a current is induced in the wires
as a result, the current flows to the slip ring, (one side of the wire is connected to one slip ring)
when the force acting on each side of the wire is changed (every half rotation), the direction of the current changes
this makes a a.c. current, and this generator is called an alternator.
factors that affect how much voltage is induced - speed that the magnet / wire is moved - strength of the magnet - the number of turns in the coil (surface area that moves through the magnetic field)