A machine to make charges was invented in 1929 by a young American called Van de Graaff. Huge machines, some over ValueUnit{30...

Teaching Guidance 11-14 14-16

Scientists often speak of a coulomb ‘falling through’ so many volts and transferring so much energy. That is rather like a 1...

Teaching Guidance 14-16

Van de Graaff generator demonstrations can provide useful insights into electrical phenomena, which are at the same time...

Teaching Guidance 14-16

These motors have separate power connections: one for the rotor (armature) and one for the field coils, usually via 4-mm...

Teaching Guidance 14-16