Question

What happens to the glow/brightness of the bulb if it is connected with three dry cells in series instead of just one dry cell?

• A. brightness increases
• B. brightness increases sudenly then drops
• C. brightness remains the same
• D. brightness increases very slowly

Answer 1

The correct option is A brightness increases

When cells are connected in series, the combined voltage increases/ adds up which in turn increases the current supplied by the cells. Therefore when a bulb is connected to three dry cells in series instead of one dry cell, its brightness increases comparitively.