7792

• UCREFRP Catalog Number: 7792
• Author: Kolz, A. L.
• Title: In-water Electrical Measurements for Evaluating Electrofishing Systems.
• USFW Year: 1993.
• USFW - Doc Type: \
• Copyright Material: NO

24 BIOLOGICAL REPORT 11
Appendix. Glossary of Electrical Terms
Conductivity (c) The ratio of the density of the
unvarying current in a conductor to the voltage
gradient that produces it. Common units of
measurement are mhos per centimeter or sie-
mens per centimeter (S/cm).
Current (I) The rate of electrical charge flow in
a circuit. The practical unit is the ampere (1 cou-
lomb/s).
Electrical charge (Q) A fundamental prop-
erty of matter that can be classified as a funda-
mental physical quantity. The practical unit is
the coulomb. The electron, the smallest charge
identified in nature, has a magnitude of 1.6 x
10-19 coulomb.
Power (P) The rate of doing work or the energy
per unit of time. The practical unit is the watt
(1 joule/s).
Power density (D) The power or energy per
unit of time dissipated in a given volume of
material. The unit of measurement is watts per
cubic centimeter.
Resistance (R) The ability to react to the flow
of AC or DC with an opposition to the flow of
current. Also, the ratio of the applied voltage to
the induced current that it produces. The unit of
measurement is the ohm.
Resistivity (r) The reciprocal of conductivity.
The common unit of measurement is the ohm-cen-
timeter.
Volts or voltage (V) The energy per unit of
electrical charge. The unit of measure is the volt
(1 joule/coulomb).
Voltage gradient (E) The rate of change of
voltage with distance. Also, the force per unit of
electrical charge. The common unit of measure-
ment is volts per centimeter.
-U.S. GOVERNMENT PRINTING OFFICE 1993-0-774-275/80008