There is an electric furnace with a rated voltage of 220 v. if you want to connect it to the 110 V line without changing the power of the electric furnace, what should you do?

Fold the electric furnace wire in half and connect it

Can physical resistance change the current? Can it change the voltage? (in the case of variable resistance)

Both can change
In fact, when changing the current, the voltage of the appliance will change. If you change the voltage of the appliance, the current will also change. Both of them change at the same time

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