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OHM's Law

Discussion in 'Beginner Electronics' started by Jonathan, Feb 16, 2005.

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  1. Jonathan

    Jonathan Guest

    Hi to all,

    If someone help me out here. The base of a transistors opens at 0.7 volts.
    If I am using 5 volts how do I work out the resistance ? Its been a while
    since I did ohms law !!

    Many thanks
  2. TurboTroll

    TurboTroll Guest

    Voltage=Current * Resistance

    You need to know two of the three before you can derive the third.
    Resistance would equal voltage divided by current, but of course, you need
    to know voltage and current. You only give the voltage.
  3. CLV3

    CLV3 Guest

    With the info that you gave us it would be impossible to find the resistance
    using Ohm's Law. To find any value in a circuit using Ohm's Law you need two
    out of the three (voltage, current, resisitance).
  4. Jonathan

    Jonathan Guest

    Many thanks for your reply, I managed to work it out using 400mA.

    Thank you
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