Question

If current in an electric bulb changes by $1$%, then the power will change by:-

• A. $2$%
• B. $4$%
• C. $1$%
• D. $\frac{1}{2}$%

Answer 1

The correct option is C $1$%

If the current is changedabruptly by 1%, the immediate change in power willbe 2%, because the filament hasn't had time tochange its temperature and thus its resistance.

so the correct option is A.