A 100-W lamp glows brighter than a 25-W lamp.The electric resistance of the 100-W lamp is
A)less.
B)greater.
C)the same.

Question

Quizplus · Accepted Answer

The brightness of a lamp depends on the amount of power it consumes (in watts). Therefore, if a 100-W lamp glows brighter than a 25-W lamp, it means that it is converting more electrical energy into light energy. This implies that the 100-W lamp has a lower resistance to the flow of electric current as compared to the 25-W lamp. This is because a lower resistance allows more current to flow, which in turn results in more electrical energy being converted into light energy (and less being dissipated as heat). Therefore, the electric resistance of the 100-W lamp must be less than that of the 25-W lamp.

A 100-W Lamp Glows Brighter Than a 25-W Lamp