(a) Why does an electric bulb become dim when an electric heater in parallel circuit is switched ON ? (b)…
(a) Why does an electric bulb become dim when an electric heater in parallel circuit is switched ON ?
(b) How to connect three resistors each of resistance 8 Ω, so that the equivalent resistance of the combination is 12 Ω ? Draw diagram of the combination and justify your answer.
Solution
(a) When the electric heater is switched on in a parallel circuit, it
draws a large amount of current. As a result, the current through
the bulb decreases, making the bulb glow dim.
(b)
•
1
• 𝑅1
=8+8
𝑅1 = 4Ω
𝑅eq = 𝑅1 + 8𝛺
𝑅eq = 12𝛺