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A transformer couples two or more AC signals through a magnetic field. Often used as galvanic isolation and to transform one AC voltage to another.

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Can't understand why oscilloscope requires incomplete circuit in order to measure voltage in...

If I build (a very poor) transformer (for pedagogic use) using a few windings of wire for the primary and secondary coils, and use a signal generator on the primary side, I can measure the voltage on the … If I use a commercial transformer whose secondary coil has a high inductance, then I can measure the voltage across the secondary in the usual way, by connecting one oscilloscope probe to one side of the …
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