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Last Updated On 01-06-2023 - By Jeesha Sara

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 :-

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

1 Answer
5876 Votes
3537

Answer Key : (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.



Next Question :

A thermocouple uses Bismuth and Tellurium as the dissimilar metals. The sensitivity of bismuth is  and that of the tellurium is  If the difference between hot and cold junction is  then the maximum output will be

a)

b)

c)

d)


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