Ohm's law Still Okay
Most recent answer: 10/22/2007
Q:
According to Ohm’s Law V is directly proportional to I. But according to relation P=VI V becomes inversely propotional to I. Does this mean that Ohm’s Law is false or is there some explanation. Could you please explain. Thanks.
- Nimish (age 15)
India
- Nimish (age 15)
India
A:
Ohm’s law states that V = R * I where V is a voltage, R is a resistance and I is a current.
The relation P = V * I says that the power, P, is proportional to the voltage times the current.
If you do the algebra you find that P = V^2 / R or, equivalently P = I^2 * R. No problem here with Ohm’s law.
LeeH
(published on 10/22/2007)