- #1
annie122
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To increase the brightness of a desk lamp a student replaces a 50 W light bulb with a 100 W light bulb. Compared to the 60 W light bulb the 100 W light bulb has?
A. Less resistance and draws more current
B. Less resistance and draws less current
C. More resistance and draws more current
D. More resistance and draws less current
Answer:A
My questions are:
1. are we assuming constant voltage?
(And I'm going to ask a really basic one: are we supplied constant voltage at our homes?)
2. brightness = k*(power)?
3. is it just a fact that higher power output devices have less resistance?