Transformer Calculator
Result:
Turns Ratio: 10.000
Voltage Ratio: 10.000
✓ Ideal transformer
What is a Transformer Calculator?
A transformer calculator is an electrical engineering tool that computes various parameters of electrical transformers including turns ratio, voltage transformation, current relationships, power calculations, and impedance matching. It helps engineers and students analyze transformer performance and design specifications.
Transformers work on the principle of electromagnetic induction, transferring electrical energy between circuits through magnetic coupling. Our calculator handles ideal transformer equations and real-world efficiency considerations for step-up, step-down, and isolation transformers.
How It Works
Select Calculation
Choose transformer parameter
Input Parameters
Enter voltage, current, turns
Analyze Results
Get electrical calculations
Common Examples
Step-Down Transformer
Primary: 120V, 1000 turns
Secondary: 12V, 100 turns
Turns Ratio: 10:1
Application: Power supplies, chargers
Step-Up Transformer
Primary: 240V, 100 turns
Secondary: 2400V, 1000 turns
Turns Ratio: 1:10
Application: Power transmission
Current Transformer
Primary: 100A, 1 turn
Secondary: 5A, 20 turns
Current Ratio: 20:1
Application: Measurement, protection
Isolation Transformer
Primary: 120V, 500 turns
Secondary: 120V, 500 turns
Turns Ratio: 1:1
Application: Safety isolation
Calculation Table
| Parameter | Formula | Description | Units |
|---|---|---|---|
| Turns Ratio | a = Np/Ns | Primary to secondary turns | Ratio |
| Voltage Ratio | Vp/Vs = Np/Ns | Voltage transformation | V |
| Current Ratio | Ip/Is = Ns/Np | Current transformation | A |
| Power | Pin = Pout/η | Power with efficiency | W |
| Impedance Ratio | Zp/Zs = (Np/Ns)² | Impedance transformation | Ω |
Frequently Asked Questions
How do I calculate the turns ratio?
The turns ratio is calculated as Np/Ns (primary turns divided by secondary turns). This ratio determines the voltage transformation and is fundamental to transformer operation.
What's the difference between step-up and step-down transformers?
Step-up transformers increase voltage (Ns > Np), while step-down transformers decrease voltage (Ns > Np). Current changes inversely to voltage.
How do I calculate transformer efficiency?
Efficiency = (Output Power / Input Power) × 100%. Typical transformers have 95-99% efficiency. Losses include copper losses (I²R) and core losses.
What is impedance transformation?
Impedance is transformed by the square of the turns ratio: Zp/Zs = (Np/Ns)². This is crucial for impedance matching in audio and RF applications.
Can I use this for three-phase transformers?
This calculator is designed for single-phase transformers. For three-phase transformers, apply the same principles to each phase, considering connection types (Y or Δ).
Is this calculator free to use?
Yes, this transformer calculator is completely free with no registration required. Perfect for electrical engineers, students, and technicians.