Asked by Anonymous
A 100-watt lamp glows brighter than a 25-watt lamp. What do you know about the resistances of these two lamps?
Answers
NEETHU
Power,P= I^2R
Since power is directly proportional to resistance R, the bulb with greater power will have greater resistance.
Since power is directly proportional to resistance R, the bulb with greater power will have greater resistance.
Elena
P₁₀₀>P₂₅ =>
U²/R₁₀₀ > U²/R₂₅.
Since U = const =>
R₂₅>R₁₀₀
U²/R₁₀₀ > U²/R₂₅.
Since U = const =>
R₂₅>R₁₀₀