Questions
Four identical electrical lamps are labelled 1.5 V 0.5 A which describes the condition necessary for them to operate at normal brightness. If a 12 V battery of negligible internal resistance is connected to lamps as shown, then
detailed solution
Correct option is B
For normal brightness of each bulb see following circuit. Current through each bulb = 0.5 ASo main current i = 2AAlso, voltage across the combination = 1.5 VSo voltage across the resistance = 10.5 VHence. for resistance, V=iR ⇒ 10.5=2 × R=R =214 ΩTalk to our academic expert!
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An electric current is passed through a circuit containing two wires of the same material, connected in parallel. If the lengths and radii of the wires are in the ratio of (4/3) and (2/3), then the ratio of the currents passing through the wires will be
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