Topic 13 - Electromagnetic induction

Question 1

Describe current induction

Answer 1

Current is induced if a wire is moved in a magnetic field. The conductor (wire) forms a potential difference (electrons move to one side of the conductor as the field changes). If the conductor is connected in a circuit, a current will flow.
(This current will produce its own magnetic field which is in the opposite direction to the first field.)

Question 2

Explain how to produce an electric current by the relative movement of a magnet and a conductor on a small scale in the laboratory

Answer 2

Spinning a coil of wire in between 2 permanent magnets will cause a current to flow in the wire, which can be shown by a sensitive ammeter (only milliamps will be generated). Passing a wire through a field will also show a deflection in an ammeter (a reading).

Question 3

Explain how to produce an electric current by the relative movement of a magnet and a conductor in the large-scale generation of electrical energy