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Batteries in parallel with a diode

  1. Jan 28, 2010 #1
    I was wondering what the effects are if any if I connect a 17V DC source in parallel with a 9 V battery but the 9 V battery has a diode that prevents current from flowing into it. Thanks
  2. jcsd
  3. Jan 28, 2010 #2


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    That's OK. Did you want the 9V battery there to give a supply if the 17V fails?
    You may also want a diode in series with the 17V supply to prevent the battery discharging back into it when it fails (in case there is a path to Earth inside the 17V supply).
  4. Jan 31, 2010 #3
    no current will flow through the circuit as the voltage drop across the reverse biased diode and the 9V battery will be equal to 17V DC source
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