1. What is Secondary Current?

The secondary current is the current on the output side of a transformer, calculated based on the primary current and the ratio of primary to secondary voltages. This relationship is fundamental in transformer operation and electrical power distribution.

2. How Does the Calculator Work?

The calculator uses the secondary 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 the secondary current is inversely proportional to the secondary voltage when primary current and voltage are constant.

3. Importance of Secondary Current Calculation

Details: Calculating secondary current is essential for transformer sizing, circuit protection, and ensuring proper operation of electrical equipment connected to the secondary side.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: Does this equation work for all transformers?
A: This applies to ideal transformers. Real transformers have small losses due to resistance, leakage flux, and core losses.

Q2: What if the secondary voltage is higher than primary?
A: The equation still applies - the secondary current will be lower than the primary current in step-up transformers.

Q3: How does load affect secondary current?
A: The secondary current changes with load, and the primary current adjusts automatically to maintain the voltage ratio.

Q4: Can this be used for three-phase transformers?
A: For balanced three-phase systems, the equation applies to phase currents and voltages.

Q5: What about transformer efficiency?
A: For more precise calculations, you would need to account for transformer efficiency (typically 95-99% for power transformers).