Current Electricity and Electrical InstrumentMedium
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
Create a free account to view solution
View Solution FreeTopic: Current Electricity and Electrical Instrument·Practice all Current Electricity and Electrical Instrument questions
More Current Electricity and Electrical Instrument Questions
′n′ identical bulbs, each designed to draw a power p from a certain voltage supply are joined in series acro...There are three voltmeters of the same range but of resistance 10000 Ω, 8000 Ω and 4000 Ω respectively. T...A 50 Ω bulb is in series with a room heater and the combination is connected across the mains. To get max. heater o...Four wire of the same diameter are connected in turn between two points, maintained at a constant difference. Their resi...A group of N cells whose emf varies directly with the internal resistance as per the equation EN = 1.5 rN are connected ...