P13-electromagnetic induction

• The strength of the magnetic field, the speed of movement of the field, having more turns per unit length on the coil of wire affect the size and direction if an induced potential difference
• step up transformers increase potential difference and decrease current to improve effeciency by reducting heat loss.They are between power stations and transmission lines
• step down transformers decrease voltage and increase current and are between transmission lines and houses
• an alternating current in one circuit can induce a current in another circuit in a transformer
• transformers can change the size of alternating voltage
• If there are more coils on the primary coil what sort of transformer is it?

  Step down transformer

  If there are more coils on the secondary coil what sort of transformer is it?

  Step up transformer