voltage drain?

Discussion in 'Homework Help' started by silver6g72, Sep 18, 2005.

  1. silver6g72

    Thread Starter Member

    Sep 18, 2005
    11
    0
    this isnt homework but its something im trying to figure out. how would i calculate if i left a light on how long it would take to drain its source (battery)? thanks
     
  2. Brandon

    Senior Member

    Dec 14, 2004
    306
    0

    A bulb pulls the power its rated at if its used at the voltage intended. So if you have a 5v, 1 watt light, then it pulls 1 watt (0.2 amps @ 5 volts)

    Batterties have a power rating given in Ampere Hours. i.e. How many hours can the battery push out 1 amp. So if you have a 5 watt bulb and a 10 ampere hour battery.

    10/0.2 = 50 hours of use given 100% efficiency.
     
  3. silver6g72

    Thread Starter Member

    Sep 18, 2005
    11
    0
    thanks man for your reply
     
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