Electronics > Beginners
Driving a 12V relay with 18V
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Dave_C:
The wasted power that james_s talked about is the power dissipated by the resistor ( 0,182W according to your calculations )
It depends on your requierments if that's acceptable or not.
If you powered the relay from a battery that would matter a lot, otherwise it's not really too much of a problem.
Adhith:

--- Quote from: Dave_C on August 22, 2018, 12:21:48 pm ---The wasted power that james_s talked about is the power dissipated by the resistor ( 0,182W according to your calculations )
It depends on your requierments if that's acceptable or not.
If you powered the relay from a battery that would matter a lot, otherwise it's not really too much of a problem.

--- End quote ---
the relay is use to charge a battery pack and its charged with a wall adapter. so I guess it wont matter that much
Raj:
Just use an src instead of relay
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