a measurement of the flow of electricity

There are 1000 milliamps in 1 Amp. Every technology attached to a security system draws current, and this is measured in milliamps, for example: a control panel generally has a 1 Amp power supply built into it, from that we need to deduct the power need for every PIR, Shock sensor, Bell box etc. If we took a basic system in normal mode it would be drawing approx. 550 milli-amps, but in alarm condition this I could jump up to about 900 milli-amps.

Small units measuring the flow of electricity. One thousand milliamps equals 1 amp.

Thousandths of an amp.

Refers to battery capacity. A 1/1000th of an amp, e.g.: 1.0Ah = 1000mAh.