[sci.electronics] How to detect current flow

chris@ntc.UUCP (chris winter) (04/12/90)

I need to be able to detect whether or not a device powered by  
household 110V supply is active or not.
I do not want to use the obvious solution of wiring a relay or 
solenoid into the circuit because of 
   a) the size of the components and 
   b) the physical nature of the devices.

Ideally what I want is a small solid-state device that detects current 
flow in the cable. 

Can anybody help me or direct me to a source of knowledge on the subject.

Many thanks in advance.

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