reduce 12 volt dc to 1.5 volt dc

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Topic: reduce 12 volt dc to 1.5 volt dc

Posted By: bob dixon
Subject: reduce 12 volt dc to 1.5 volt dc
Date Posted: March 01, 2006 at 1:23 PM

I have a digital compase that orininally is powered by a 1.5 volt battery, can I use a resistor to lower the voltage from12 volts to 1.5 volts so I can hard wire the compass into my vehicle?

Replies:

Posted By: ta400
Date Posted: March 01, 2006 at 7:14 PM

for to start it 's necessary that you know the consumption of your apareil (amperage) then all is simple the formula is the voltage (13.8) divided by amperage . the result give you the value of the resistance in ohm.

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ta400

Posted By: godblessdremil
Date Posted: March 01, 2006 at 10:05 PM

a car varies between 12.8-14.4 (14.4 while charging and constant power will probally be 12.8 when car is off). Other then that its simply ohms law oh ya you need to know the amps it draws but it safe to assume its the same as the battery and it should have it written there.

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