Transformers Flashcards
What makes up a transformer
Primary coil, secondary coil and iron core
Why is iron used in a transformer
Iron is easily magnetised
What is the transformer equation
Vp/Vs=Np/Ns
If Vs>Vp , is this a step up or step down transformer
Step up transformer
If Vs<Vp , is this a step up or step down transformer
Step down transformer
What is the equation relating current and potential difference in each coil
Vs x Is= Vp x Ip
What does Vs stand for
Potential difference in the secondary coil
what does Is stand for?
Current in secondary coil
what does Vp stand for?
potential difference in primary coil
what does Ip stand for?
current in primary coil
state the effect step up transformers have on potential difference and current
p.d increases current decreases
state the effect step down transformers have on potential difference and current
p.d decreases current increases
why are step up transformers used
to reduce energy loss from cables (thermal)
why are step down transformers used
to reduce the potential difference to make it safe for domestic use
