Current per hour? and tilt swtiches

[timothyjackson]

Dear all, 2 simple questions - non electronic engineer here

1. If an electronic circuit measures 2mA draw/current usage - how much is this per hour?

Generally, how can the hourly current consumption be calculated?

2. Need to source a tilt switch which has the following properties

2.1 cheap
2.2 highly sensitive (i.e. could vibrate/tilt/activate from the vibrations of a car driving
3.3 zero leakage (i.e. when in OFF position [not tilted] no current can leak through its connections) -
3.4 Operating at 1.5 > 2V

thanks in advance

 

[Aily Sajjad]

Hi,

1-

I think you need to know the Amp-Hours for the battery you need to power the circuit with. A circuit that draws 2mA can be powered for 1 hour by a battery that is rated 2mA-hr (2 hrs if the battery is 4ma-Hr). This is the theory. Practically if you do so, the time will be less than 1 hr. This is beacuase the voltage drops gradually as the battery gets discharged.

Amp-Hours is rated for batteries - not for circuits. A battery with 2Amp-Hr rating is one which can provide you 2 Amps current for 1 hour befor getting discharged.

2-
I dont know.

Aily
-------
MoM!!! I need some electrons to play with.

 

[Russlk]

2. use a mercury tilt switch. Some noisless light switches use a mercury tilt switch.

 

[Hero999]

1. If an electronic circuit measures 2mA draw/current usage - how much is this per hour?

2mA/hour....