http://www.vanoustech.com/output-transformer/
A transformer for a laptop computer converts a 120V input to a 24-V output. Show that the primary coil has?
A transformer for a laptop computer converts a 120V input to a 24-V output. Show that the primary coil has five times as many turns as the secondary coil has.
The ideal transformer equation is
Vs / Vp = Ns / Np = Ip / Is
where s is secondary and p is primary, V is voltage, N is number of turns and I is the current.
Ignoring the currents, we have
Vs / Vp = Ns / Np
24 volts / 120 volts = Ns / Np
1/5 = Ns / Np
(inverting)
5 = Np / Ns
This equation means that primary coil has 5 times as many turns as the secondary coil.
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