You need a closed circuit. You also need a voltage source.
You need a closed circuit. You also need a voltage source.
If an electrical current flows, there will be a magnetic field. This is a law of nature; so all you need to do - basically - is make sure a current flows. The current should be DC.
Electricity needs to be a complete circuit to operate. current leaves the positive side and flows through the wires, into the operated device, out the other side and returns to the battery. Without the return or allowing the current to flow nothing happens.
No, an electromagnet does not need to warm up. It can generate a magnetic field instantly when an electric current flows through its coils.
you need to complete the level before
You will need to complete the quests before it.
You can get it after you complete Pokemon Channel, a GameCube Game, you need to complete the elite 4 before you can get it
No, a rough draft does not need to be complete before moving on to the final version. It is common to revise and edit a rough draft multiple times before finalizing the content.
No, but it helps. Warm oil flows out much more easily.
A transformer winding only produces a magnetic field when current flows through it. Switch the current off, and the magnetic field disappears. You do not need to 'demagnetise' a transformer winding.
Need a more complete question before we can answer.
There is no current in TV cable, there is no need to disconect it before cutting. Nothing will happen.