ALTERNATING CURRENT
Electrical current that reverses its direction (negative to positive) periodically.

INTERMITTENT DUTY
A device that is designed to operate for a short period of time; generally less that 45 seconds

CONTINUOUS DUTY
A device that is designed to operate continuously without rest.

NORMALLY OPEN
Thte position of a contact before it is energized; (open) Example: A switch is not depressed that the circuit is complete.

DECIBEL (dB)
Measurement on sound energy usually compared to the amount of sound the human ear can detect.

NORMALLY CLOSED
The position of a contact before it is energized; (closed) Example: A switch is not depressed and the circuit is complete.

FAIL SAFE
A device that is normally open and locks when power is applied to the unit. Example: During a loss of power the device remains open.

OHMS
The measure of resistance of an electrical device to resist the flow of energy.

FAIL SECURE
A device that is normally closed or locked until power is applied. Example: During a loss of power the device remains locked.

RECTIFIER
A device that is comonly used to convert AC to DC. Commonly used to silence the audible sound that an electrical strike can make while energized on AC current

FUSE
A device that is placed in the path of energy that will break the circuit if the current becomes too great. This is accomplished by having a strip or metal that will melt when the currect exceeds the required amount.

RELAY
An electro-magnetic device activated by a variation in conditions in one electric circuit and controlling a larger current or actuating other devices in the same or another electric circuit.

STANDARD VOLTAGE
Electric door strike supplied with magnetic coils: 4-6FDC/8-16VAC. Electric door strikes supplied with a solenoid coil: 6-10VDC, 10-16VAC: other voltages available (See Electrical Characteristics Chart).

VOLT
A unit of electric potential equial to the difference of electric potential between two points that have a resistance of one ohm and through which a current of one ampere is flowing.

WATT
The power developed in a circuit by a current of one ampere flowing through a potential difference of one volt.