# RESISTIVITY

The amount of resistance in a system. Resistivity is the reciprocal of CONDUCTIVITY.

## Related Terms

### PILOT WIRE REGULATOR

Automatic device for controlling adjustable gains or losses associated with transmission circuits to compensate for transmission changes caused by temperature variations, the control usually depending upon the resistance of a conductor or pilot wire having substantially the same temperature conditions as the conductors of the circuits being regulated.

### PHOTOELECTRIC

Pertaining to the electrical effects of light, such as the emission of electrons, generation of voltage, or a change in resistance when exposed to light.

### NYQUIST'S THEOREM

The mean square noise voltage across a resistance in thermal equilibrium is four times the product of the resistance, Boltzmann's constant, the absolute temperature, and the frequency range within which the voltage is measured.

### MULTIROPE FRICTION WINDER

A winding system in which the drive to the winding ropes is the frictional resistance between the ropes and the driving sheaves.

### MODULUS OF ELASTICITY IN SHEAR

A measure of a material's resistance to shearing stress, equal to the shearing stress divided by the resultant angle of deformation expressed in radians. Also known as coefficient of rigidity; modulus of rigidity; rigidity modulus; shear modulus.

### MEGOHMMETER

An instrument which is used for measuring the high resistance of electrical materials of the order of 20,000 megohms at 1000 volts; one direct-reading type employs a permanent magnet and a moving coil.

### MAGNETORESISTANCE

The change in the electrical resistance of a material when it is subjected to an applied magnetic field, this property has widespread application in sensors and magnetic read heads.

### LIQUID SEMICONDUCTOR

An amorphous material in solid or liquid state that possesses the properties of varying resistance induced by charge carrier injection.

### LENARD SPIRAL

A type of magnetometer consisting of a spiral of bismuth wire and a Wheatstone bridge to measure changes in the resistance of the wire produced by magnetic fields and as a result of the transverse magnetoresistance of bismuth.

### LEAKAGE RESISTANCE

The resistance of the path over which leakage current flows; it is normally high.

### Related questions

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