Asked by Michael
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.
Answers
Answered by
drwls
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.
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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