[Mini] [minElist] Wiring instruments in parallel or series?

[John Lieberman]

If you wire any two components in series, they're going to split the 
available voltage.  Plus, if they have unequal current draw, you could 
fry the one with the lower draw because the same amount of current will 
be passing through both components.  Therefore, you would want to wire 
in parallel to keep the voltage constant to every component.

JL


On 3/19/2016 1:06 PM, Dr John C Bullas john.bullas at gmail.com [minilist] 
wrote:
> Greetings from FatBlokeRacing Pits
>
> I have a quick question.... or two
>
> 1) Things like water temperature and oil pressure senders operate by 
> varying the voltage/resistance passing to earth through the sender for 
> the negative side of the gauge .....and this is use to displace a 
> needle via a magnetic doo-dads.....
>
> If i want to measure whatever the gauge is measuring in the same way 
> (and knowing the range of the resistance over the 0-100 psi or 0-120c 
> range) will connecting another earth return wire to the sender, screw 
> up the readings?
>
> Indeed could you tap off at the back of the negative side of the guage 
> and not screw up the readings?
>
> The monitoring board would place a minute "load"  on the circuit I 
> guess or minute resistance
>
> https://www.flickr.com/photos/johnbullas/25258092774/
>
> could this just go into the existing earth return wire to the sender?
>
> Discuss......
>
> FB
>
>
>
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