TM 1-1500-204-23-4
GLOSSARY
AMMETER
An instrument that measures either ac or dc current.
CONDUCTOR
A bare or insulated wire or combination of wires not insulated from one
another, suitable for carrying electrical current. They usually are copper,
aluminum, steel or silver.
FREQUENCY
The number of complete cycles in one second of alternating current,
voltage, or electromagnetic pressure waves.
HYSTERESIS
The difference obtained on measuring instruments containing iron when
the current is increased to a definite value and when the current is
reduced from a higher value to the same definite value.
LOAD
The power consumed by a machine or circuit in performing its function.
POLARITY
Having two opposite charges, one positive and the other negative.
VOLTAGE
Electrical pressure; the force which causes current to flow through an
electrical conductor.
VOLTMETER
A current measuring instrument designed to indicate voltage by
measuring the current flow through a resistance of known value.
WAVE
An activity that rises and falls, or advances and retreats, as it travels
through a medium.
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