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To better understand the following formulas review the rule of transposition in equations.
A multiplier may be removed from one side of an equation by making it a division on the other side, or a division may be removed from one side of an equation by making it a multiplier on the other side.


1. Voltage and Current: Primary (p) secondary (s)
Power(p) = power (s) or Ep x Ip = Es x Is

 
A. Ep = Es x Is
Ip
B. Ip = Es x Is
Ep
C. Is = Ep x Ip
Es
D. Es = Ep x Ip
Is

2. Voltage and Turns in Coil:
Voltage (p) x Turns (s) = Voltage (s) x Turns (p)
or Ep x Ts = Es x Ip

A. Ep = Es x Ip
Ts
B. Ts = Es x Tp
Ep
C. Tp = Ep x Ts
Es
D. Es = Ep x Ts
Tp




3. Amperes and Turns in Coil:
Amperes (p) x Turns (p) = Amperes (s) x Turns (s)
or Ip x Tp = Is x Ts

A. Ip = Is x Ts
Tp
B. Tp = Is x Ts
Ip
C. Ts = Ip x Tp
Is
D. Is = Ip x Tp
Ts

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