Transformers Flashcards
1
Q
What is the name of a transformer used in a phone charger?
A
Switch mode transformer
2
Q
How is a transformer structured?
A
An iron core, with a primary and secondary coil wrapped around it
3
Q
Transformers only work with _______ current
A
Alternate
4
Q
How do a step down transformer and step up transformer affect potential difference
A
Decreases potential difference and Increases potential difference
5
Q
Why are switch mode transformers more useful than traditional transformers
A
Work at higher frequencies so they can be made much lighter
Much more efficient
6
Q
A transformer has 40 turns on the primary coil, and 800 on the secondary coil. If the input potential difference is 1000V, work out the output potential difference.
Vp/Vs=Np/Ns
A
Flip equation so that: x/1000 = 800/40 800/40=20 1000*20=20,000 Vs=20,000
