Free Transformer Calculator
Calculate transformer output voltage and current using the turns ratio: V2/V1 = N2/N1.
V
A
Secondary Voltage
12.00 V
Turns Ratio (N2/N1)0.1000
Secondary Current10.0000 A
Secondary Voltage vs Primary Voltage
Transformer
A transformer transfers electrical energy between circuits via magnetic coupling, changing voltage and current levels.
Formulas
V2 / V1 = N2 / N1 (voltage ratio equals turns ratio)
I2 / I1 = N1 / N2 (current ratio is inverse of turns ratio)
Power is conserved in an ideal transformer: P1 = P2.
Example Calculation
A step-down transformer: 120 V input, 500 primary turns, 50 secondary turns, 1 A primary current.
- 01Turns ratio = N2/N1 = 50/500 = 0.1
- 02V2 = V1 * N2/N1 = 120 * 0.1 = 12 V
- 03I2 = I1 * N1/N2 = 1 * 500/50 = 10 A
- 04Power check: 120*1 = 12*10 = 120 W
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