Current Electricity and Electrical InstrumentHard
Question
Two bulbs rated (25Ω - 220Ω) and (100Ω - 220Ω) are connected in series to a 440V line. Which one is likely to fuse?
Options
A.25Ω bulb
B.10Ω bulb
C.both bulbs
D.None
Solution
(25W - 220 V)
P1 =
= 1936 Ω
(100w - 220V)
P2 =
= 484 Ω
In Series (I same)
H = I2Rt, H ∝ R so if R1 > R2 then H1 > H2
R1 is likely to fuse
P1 =
= 1936 Ω(100w - 220V)
P2 =
= 484 ΩIn Series (I same)
H = I2Rt, H ∝ R so if R1 > R2 then H1 > H2
R1 is likely to fuse
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