A transformer is comprised of two coils placed together with a variable current, iL in the left coil and iR in the right coil.
The coils have the number of turns NL and NR for the left and right coils, respectively.
From Lenz's law, the electromotive force generated in the left and the right coils can be written as:
ε = - NdΦ/dt
Which of the following can a transformer accomplish?
A) Changing current but not voltage.
B) Changing power
C) Changing voltage but not current
D) Changing both current and voltage.
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