According to the formula V=IR, Potential Difference is directly proportional to Current. But according to P=VI (P/I=V) Potential Difference is inversely proportional to Current. What is the cause of contradiction and what is the true fact?

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Solution

Acc. to ohm's law,
V = IR , where R is a constant.
â‡’ V âˆ I
P = VI
â‡’ V = P/I
â‡’ Potential difference (V) is given by the ratio of P and I. Here P is not a constant. As current is varied so does the voltage and hence the power.

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According to the formula V=IR, Potential Difference is directly proportional to Current. But according to P=VI (P/I=V) Potential Difference is inversely proportional to Current. What is the cause of contradiction and what is the true fact?

Acc. to ohm's law,V = IR , where R is a constant. â‡’ V âˆ IP = VIâ‡’ V = P/Iâ‡’ Potential difference (V) is given by the ratio of P and I. Here P is not a constant. As current is varied so does the voltage and hence the power.

Acc. to ohm's law,
V = IR , where R is a constant.
â‡’ V âˆ I
P = VI
â‡’ V = P/I
â‡’ Potential difference (V) is given by the ratio of P and I. Here P is not a constant. As current is varied so does the voltage and hence the power.