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Math Help - Ohms Law equation - Help please, I don't get it

  1. #1
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    Ohms Law equation - Help please, I don't get it

    Is anybody able to help me with the following:

    Calculate the magnitude of the current I when a voltage of 100 V is applied across a resistance R of 10^12 (Ohms law).

    I don't even know where I'm meant to start, or how I'm meant to work this out.
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  2. #2
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    Quote Originally Posted by AJShaw View Post
    Is anybody able to help me with the following:

    Calculate the magnitude of the current I when a voltage of 100 V is applied across a resistance R of 10^12 (Ohms law).

    I don't even know where I'm meant to start, or how I'm meant to work this out.
    Substitute into V = IR. Solve for I (use a basic index law).
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  3. #3
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    v = IR

    I = 100v/10^12

    I = 1 x 10^-10


    Is this right? If it is wrong, can you show me step by step how to work it out, please?
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  4. #4
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    Quote Originally Posted by AJShaw View Post
    v = IR

    I = 100v/10^12

    I = 1 x 10^-10


    Is this right? [snip]
    Yes. (Except that the answer should have a unit. When working in V and Ohms the unit of current is Amp).
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  5. #5
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    Thank-you so much
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