The magnet in an MRI is a superconducting electromagnet. It needs power once, to charge it up, then you close the loop and it just sits there being a superconducting electromagnet. The only power used continuously is for cooling, which is to say, when ambient room heat leaks in, it has to be carried out again. The magnet itself does not produce heat; it has no electrical resistance because it is a superconductor.
The magnet in an MRI is a superconducting electromagnet. It needs power once, to charge it up, then you close the loop and it just sits there being a superconducting electromagnet. The only power used continuously is for cooling, which is to say, when ambient room heat leaks in, it has to be carried out again. The magnet itself does not produce heat; it has no electrical resistance because it is a superconductor.