Questions
If a 30 V 90 w bulb is to be worked on a 120 V line, a resistance of how many ohms should be connected in series with the bulb?
detailed solution
Correct option is C
Suppose resistance R is connected in series with bulb. Current through the bulb, i=9030 =3 AHence for resistance V = iR⇒ 90=3 × R ⇒ =30 ΩTalk to our academic expert!
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A resistor R is connected across a battery of emf 12 V. It observed that terminal potential differenceis 9 V and the power delivered to resistor is 18 W. Internal resistance of the battery ‘r’ and the resistance R are respectively
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