Two bulbs 40 W and 60 W and rated voltage 240 V are connected in series across a potential difference of 420 V. Which bulb will work at above its rated voltages?
a)
40 W bulb
b)
60 W bulb
c)
Both will work
d)
None of these
Two bulbs 40 W and 60 W and rated voltage 240 V are connected in series across a potential difference of 420 V. Which bulb will work at above its rated voltages?
a)
40 W bulb
b)
60 W bulb
c)
Both will work
d)
None of these
Question ID - 150300 | SaraNextGen Top Answer
Two bulbs 40 W and 60 W and rated voltage 240 V are connected in series across a potential difference of 420 V. Which bulb will work at above its rated voltages?
a)
40 W bulb
b)
60 W bulb
c)
Both will work
d)
None of these
|
Two bulbs 40 W and 60 W and rated voltage 240 V are connected in series across a potential difference of 420 V. Which bulb will work at above its rated voltages? |
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a) |
40 W bulb |
b) |
60 W bulb |
c) |
Both will work |
d) |
None of these |
1 Answer
127 votes
Answer Key / Explanation : (b) -
|
(b) Resistance of 40 W bulb
It’s safe current Resistance of 60 W bulb
It’s safe current When connected in series to 420 V supply, then the current
Thus, current is greater for 40 W bulb, so it will fuse. |
127 votes
Answer Link
127