How do I calculate a transformer current

Transformer (transformer, number of turns)

What is a transformer? What is it with the number of turns? In this section we will go into this and give you the appropriate formulas for calculating important properties. This article belongs to the field of electrical engineering or physics.

With a transformer - often also referred to as a transformer in abbreviated form - alternating voltages are transformed up or down. The structure of a transformer consists of two coils, which are arranged next to each other and have different numbers of windings. A voltage is applied to the first coil and, depending on the number of turns of the coils, an output voltage is set on the second coil. For all those who are not yet familiar with electricity, voltage or alternating voltage, we offer the articles here to read:


Transformer: formulas

Time for a formula to calculate voltages and turns. The following equation establishes the relationship for the ideally unloaded transformer.

Voltage and number of turns

  • Formula: U1 : U2 = N1 : N2
  • "U1"is the voltage on the first coil in volts
  • "U2"is the voltage across the second coil in volts
  • "N1"is the number of turns of the first coil
  • "N2"is the number of turns of the second coil


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