Posted by **Michael** on Saturday, April 4, 2009 at 2:29pm.

A 100 watt lamp glows brighter than a 25 watt lamp. What do you know about the resistences of these two lamps. How can you increase their power.

- Physics -
**drwls**, Saturday, April 4, 2009 at 2:39pm
P = V^2/R

Assuming that the voltage V is the same for both lamps, the lower-R lamp bulb uses more power, and produces more light.

Power can be increased somewhat by inccreasing V, but this will greatly shorten the life of the bulb. A 20% increase in V may burn it out right away.

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