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CBSE Class 10 Answered

What is the mathematical expression to calculate potential difference between two points? Is it 
V = IR     or      V = W/Q ?
Asked by gpnkumar0 | 14 Jun, 2017, 09:39: PM
answered-by-expert Expert Answer
Electric potential difference between two points in an electric circuit carrying some current is the work done to move a unit charge from one point to another. Thus, potential difference is the work done per unit charge and is given as V =W/Q.

Also, according to the ohm's law the potential difference, V, across the ends of a given metallic wire in an electric circuit is directly proportional to the current flowing through it, provided its temperature remains the same”. This relation is given as V = IR.

So, both the relations are correct. In the case of solving sums, write down the given data and accordingly use to one the formula to find the unknown quantity as per the requirement. 
Answered by Yashvanti Jain | 15 Jun, 2017, 09:42: AM

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