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    I've been told to find the ratio of power dissipated at 30s and at 0s on a graph that shows current and time. I don't have a clue how to find power, I think I can find charge with the gradient with current/time.
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    (Original post by nandocalrissian)
    I've been told to find the ratio of power dissipated at 30s and at 0s on a graph that shows current and time. I don't have a clue how to find power, I think I can find charge with the gradient with current/time.
    The power dissipated in a resistance R ohms is given by P=I^2R

    You can evaluate this with two different values of I to find the ratio that you need.
 
 
 
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