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Hertz (Hz):
A unit of frequency equal to one cycle per second.
Joule Rating:
A measurement of how much surge can be absorbed by a surge suppressor device. The higher the
joule rating, the more surge it can absorb.
Peak Current:
The maximum current which flows during a complete cycle without permanent change in
breakdown ratings or published life specifications.
Power:
The energy dissipated into an electrical or electronic circuit or component that is conducting either AC or
DC. Electric energy developed to do "work" such as the voltage from an amplifier used to drive a speaker.
Power Line:
Two or more wires conducting electric power from one location to another.
Radio Frequency Interference:
Any electrical signal capable of being propagated into and interfering with the
proper operation of electrical or electronic equipment. The frequency range of such interference may be taken to
include the entire electromagnetic spectrum.
Spike:
An abrupt transient which comprises part of a pulse, but exceeds its average amplitude considerably.
Surge:
A large, sudden change of voltage or current, usually caused by the collapse of a magnetic field or by a
shortened or opened circuit element.
Surge Protector:
A device that protects component circuitry from high alternating voltage peaks or transients.
Transient:
A momentary surge on a signal or power line which may cause component breakdown or failure.
UL:
A common abbreviation for Underwriters’ Laboratories, Inc., a corporation supported by some underwriters for
the purpose of establishing safety standards on types of equipment or components.
Video Noise:
In the video-frequency range, any electrical disturbances introduced from a source extraneous to the
signal.
Volt (V):
The unit of measurement of electromotive force. One volt is equivalent to the force required to produce a
current of one ampere through a resistance of one ohm.
Voltage:
Electrical pressure, i.e. the force which causes current to flow through an electrical conductor.
Voltage Rating:
The maximum voltage which an electrical device or component can sustain without breaking down.
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