List of top Physics Questions on Electric Power asked in COMEDK UGET

An electric coil is rated $400\text{ W}$, $200\text{ V}$. It is cut into two equal parts and connected in parallel to the same source of $200\text{ V}$. Calculate the percentage increase in energy produced per second.

Across the \( 220 \, V \) source of internal resistance \( 20\Omega \), how many lamps of \( 40 \, W, 100 \, V \) can be connected in parallel so that all the lamps may glow with full brightness.