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Physics ohms law help

I understand the relationship between current and voltage for an ohmic conductor but not power and potential difference. Could anyone explain this to me? The answer on the mark scheme is D.
Reply 1
P=VI

I=V/R

sub the second into the first and you get

P=V^2/R

and simirlarly you can show that

P=I^2 R
which are both useful results

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