1. What is Transformer Secondary Amperage?

The secondary amperage in a transformer is the current on the output (secondary) side, which is determined by the primary current and the voltage ratio between primary and secondary windings.

2. How Does the Calculator Work?

The calculator uses the transformer current equation:

Where:

• \( I_{secondary} \) — Secondary current (amps)
• \( I_{primary} \) — Primary current (amps)
• \( V_{primary} \) — Primary voltage (volts)
• \( V_{secondary} \) — Secondary voltage (volts)

Explanation: The equation shows that current transforms inversely with voltage in an ideal transformer (ignoring losses).

3. Importance of Secondary Current Calculation

Details: Knowing secondary current is crucial for proper wire sizing, circuit protection, and ensuring the transformer can handle the load without overheating.

4. Using the Calculator

Tips: Enter primary current in amps, primary and secondary voltages in volts. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Does this account for transformer efficiency?
A: No, this calculates ideal secondary current. Real transformers have losses (typically 95-99% efficient for power transformers).

Q2: What about three-phase transformers?
A: The same equation applies for per-phase calculations in balanced three-phase systems.

Q3: Can I use this for step-up transformers?
A: Yes, the equation works for both step-up and step-down transformers.

Q4: How does load affect secondary current?
A: Secondary current increases with load, which increases primary current to maintain the ratio.

Q5: What if my transformer has multiple secondaries?
A: Calculate each secondary separately based on its voltage and the shared primary current.