Here are some  transformer formulas that may be useful.

Options:
- Useful Formulas
- Motor Formulas

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

For more Transformer Information Check out Useful Information.

Check out these Online Calculators!

If there is anything you would like to add or if you have any comments please feel free to email E.T.E.

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##### 2007, Electricians Toolbox Etc... Design by TC

Information found here was excerpted from Electrical motor Controls
by Rockis & Mazur and Ugly's Electrical Refernece by Hart