It is a conductor. Most keys are made of metal, and Metal is one of the best conductors in existence. A conductor being something that accepts electricity, such as a copper wire, and an insulator something that doesn't let it through, such as rubber.
its a conductor
A key would be a conductor. ------------------------------------------------------ That would depend on what the key was made of. Keys made out of metals would be conductors, while contactless plastic car keys would be insulators.
Motion
Motion
The key is typically made of metal, which is a good conductor of electricity. This allows the key to transmit electricity to operate electronic components in a device such as a car or a door lock.
A key is typically not a conductor of electricity on its own. However, if the key is made of a metal such as copper or aluminum, which are good conductors of electricity, then it can conduct electricity. The key would need to be part of a circuit for it to conduct electricity.
A metal key would conduct electricity.
Motion
A changing magnetic field, in the conductor, can induce a voltage (and, under the correct conditions, that in turn will result in a current). In the case of a permanent magnet, either the magnet or the conductor has to move.
If door knob is a metal then it is conductor if not like wood then insulator.
A homopolar motor works by using a magnetic field to create motion. It consists of a battery, a conductor, and a magnet. When the conductor is placed between the battery terminals and a magnetic field is applied, a current flows through the conductor, creating a force that causes the conductor to rotate. The key principles behind its operation are Faraday's law of electromagnetic induction and the Lorentz force law.
Generally a #6 copper conductor will do the job. The key to this grounding is that the ground conductor has to be taken back and connected to the service ground wire for optimal performance.