Question

The potential difference across the wire having fixed resistance is tripled.By how much does the electric power increase?

Answer 1

Solution :

Given that, potential difference across the wire having fixed resistance is tripled.

And we have to find out, by how much does the electric power increase.

Explanation :

Let the new potential difference be 3v [∵ It is tripled ]

And as resistance is fixed, so resistance = R

Now we know that,  

                             Power (P) = V²/R  

Putting the values,  

⇒ P' = (3v)²/R

⇒ P' = 9v²/R

⇒ P' = 9 × (v²/R)

So we can that,

∴ Electric power increases by 9 times the initial value.

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Answer 2

Answer:

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