POWER FACTS AND CALCULATIONS
TERMINOLOGY
& RELATIONSHIPS
Amperage
is a measure of current flow. (Similar to capacity or volume
of flow.) A power supply with greater amperage capacity than the current
demand of the equipment being powered is
OK.
Amps = Watts / Volts
(100 Watts at 24 Volts = 4.17 Amps)
Current
(Amps)
= Voltage / Resistance
(Ohms)
Impedance
in an AC circuit is very similar to resistance in a DC circuit
and is often used interchangeably.
Resistance
is a force that opposes current flow in a circuit.
Voltage
is a measure of potential electromotive force (similar to pres-
sure).
A power supply with higher voltage than recommended for a camera is
NOT OK
.
Voltage Drop/100 Feet = .2 x Amperage x 1.26
(AWG-10)
Watts = Volts x Amps
(24 Volts with 4.17 Amps = 100 Watts)
PS1-24 Owners Manual.pub
page 4
Tuesday, September 26, 2006 13:27
