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

Q: 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 ............... $ohm$

c (c) Suppose resistance $R$ is corrected in series with bulb. Current through the bulb $i = \frac{{90}}{{30}} = 3\,A$ Hence for resistance $V = i\,R$$ \Rightarrow $ $90 = 3 \times R \Rightarrow R = 30\,\Omega $

SECTION - A [PHYSICS MCQ]

GSEB - English Medium

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 ............... $ohm$

A$10$
B$20$
C$30$
D$40$

Medium

STD 11 Science
JEE
STD 12 - 3. current electricity
Physics

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