p13 Flashcards
what factors affect the size and direction of induced potential difference?
The number of turns in the coil of wire, the strength of the magnetic field and how fast the magnetic field changes or moves past the coil
what happens in a transformer?
an altering current in one circuit can induce a current in another circuit in a transformer
what can Transformers do?
change the size of an alternating voltage
in the national grid, why is electrical energy transferred at high voltage from power stations?
it improves efficiency by reducing heat loss in transmission lines
where are step up transformers used in the National Grid
after the power station, before transmission lines
what do you step up? Transformers do
increases the potential difference
where are step down transformers used in the National Grid
in local substations (between the transmission lines and homes, shops and offices,)
