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# CONTACT POTENTIAL DIFFERENCE

 The potential difference that exists across the space between two electrically connected materials. Also known as contact electromotive force; contact potential; Volta effect.

## Related Terms

### CONTACT ELECTRICITY

An electric charge at the surface of contact of two different materials. contact electromotive force See contact potential difference. contact gear ratio See contact ratio.

### INTERFACE RESISTANCE

1. Impairment of heat flow caused by the imperfect contact between two materials at an interface. 2. Quantitatively, the temperature difference across the interface divided by the heat flux through it.

### INTRINSIC CONTACT POTENTIAL DIFFERENCE

True potential difference between two perfectly clean metals in contact.

### ALLOWANCE

An intentional difference in sizes of two mating parts, allowing clearance usually for a film of oil, for running or sliding.

### PHASE-BALANCE RELAY

Relay which functions by reason of a difference between two quantities associated with different phases of a polyphase circuit.

### DISENGAGE

To break the contact between two objects.

### COMPRESSOR VALVE

A valve in a compressor, usually automatic, which operates by pressure difference (less than 5 pounds per square inch or 35 kilopascals) on the two sides of a movable, single-loaded member and which has no mechanical linkage with the moving parts of the compressor mechanism.

### FLOATING ROOF

A type of tank roof (steel, plastic, sheet, or microballoons) which floats upon the surface of the stored liquid; used to decrease the vapor space and reduce the potential for evaporation.

### NEGATIVE POTENTIAL

An electrostatic potential which is lower than that of the ground, or of some conductor or point in space that is arbitrarily assigned to have zero potential.

### VOLT

A derived unit of electric potential in the International System of Units, it is the difference of electric potential between two points of a conducting wire carrying a constant current of 1 ampere, when the power dissipated between these points is equal to 1 watt.

### Related questions

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