I f I replace a flashlight bulb (2.2v / .25a) with a bulb that is (2.47v / 30

  1. profile image50
    krprettyposted 7 years ago

    I f  I replace a flashlight bulb (2.2v /  .25a)  with a bulb that is (2.47v / 300ma) would I...

    have a brighter or duller light? Need to replace the bulb & cannot find a 2.2v / .25 amp bulb in my area. If the volts / amps increase will I get a brighter or duller light. Can find bulbs with very close specs, however would like to know if I should go lower or higher with the specs. Would like to get a bulb that will as bright or brighter than the one I'm repalcing.

    Thks, Keith

  2. Rik Ravado profile image92
    Rik Ravadoposted 7 years ago

    The new bulb would have a slightly lower resistance so the bulb would be a little brighter but values are so close should work fine.

    Here is the maths:

    Resistance of old bulb is V/I = 2.2/0.25 = 8.8 ohms
    Resistance of new bulb        = 2.47/0.30 = 8.23 ohms

 
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