In an experiment involving a Transfomrer with primary and secondary solenoid coi

Question

In an experiment involving a Transfomrer with primary and secondary solenoid coils:

1) After running current through the primary for a few minutes, you may notice that it heats up, but the secondary doesn’t. Why do you think this is?

2) How should we set the number of turns in the coils to produce a step-up transformer? A step-down transformer?

3) What happens to the current as we increase the amount of stepping of our transformer? Does this help explain why the primary was warm but not the secondary? How does this result demonstrate that we can’t just use a step up transformer to create free energy?

Explanation / Answer

If the secondary coil is NOT connected to a load device, this means that there is no current running through secondary. The current would run only if the secondary is not left as an open circuit.
Hence, primary has current flowing through it, which causes joules heating and hence heats up the primary, but secodary has no current , so no joule heating

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