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Q: What is function of the holding coil?
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What is function of pressure coil in a watt meter?

A 'pressure coil' is an archaic term for a 'voltage coil' (UK terminology) or 'potential coil' (US terminology), as opposed to the 'current coil' in a wattmeter. This coil is connected in parallel with the supply, while the current coil is connected in series with the load.


What is the function of a screw?

Retaining or holding things together.


What is the function of contactor?

A contactor is used like a switch. It is used to open and close the circuit it is in series with by electrically energizing and de-energizing the holding coil of the contactor. By having this adaptability the circuit can be remotely operated from a distance and the operator does not have to be in close proximity to the circuit. Contactors are used to remotely operate banks of lighting and of course the contactor is used for motor control. On contactors that control motors an additional overload block is added to the bottom side of the contactor to protect the motors if they get into an over load condition. The N.C. contacts in the overload block will open and the holding coil of the contactor will de-energize and drop the motor off line.


How does mobius coil generate electricity?

A mobius coil doesn't generate electricity by itself. If power is applied to function the mobius coil, positive and negative fields applied in opposing direction, then they cancel each others field out supposedly producing a scalar wave. A scalar wave is part of the Quantum theory of particle-wave duality.


Coil of wire that when carrying an electric current produces a magnetic field?

Your question is unclear. If you are asking whether it produces a magnetic field, then yes it does. If you are asking what the coil is called, then it depends on the function of that coil -it could be a solenoid; it could be a transformer winding; it could be a generator's field winding; etc. You really must learn to ask a proper question.