In a house, electrical outlets are wired in parallel. This means that the voltage (V) across each bulb is the same (typically 220-240V in India). The power (P) dissipated by a bulb, which determines its brightness, is given by the formula P = V²/R, where R is the resistance. For a constant voltage V, power P is inversely proportional to resistance R. Therefore, a brighter bulb (higher power) has a lower resistance, and a dimmer bulb (lower power) has a higher resistance.
Of the two bulbs in a house, one glows brighter than the other. Which of the two has a larger resistance?
Asked in UPPSC Upper Mains 2013 · Topic: Electric Current (Electrical Power and Energy, Joule heating effect)
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