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If a 1.5V,3W torch light bulb is connected in series with a
15HP/11.19KW,230V single phase motor and the combination is
connected against a 230V supply and switched on than what
will happen keeping all other parameters as it should be
A)the bulb will glow normally B)the bulb will not glow C)the
bulb will glow with extra brightness D)the bulb will burn
out and if a fuse is connected to the above circuit will
something happen to the fuse and what about the single phase
motor will it be affected?
Please explain with derivation
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Answer Posted / azam
Hay raj you are wrong man 11.19kw moter draws less than 20Amps
P=VICOSØ for single phase motor where V=230v and if we assume cosØ=0.85 then current drawn by motor is
I=P/VcosØ=11.19*1000watts/230v*0.85=57.23amps
And kndeed bulb. Cnnected in series will blow up like fuse wire due to 3 to 8 times starting current passing througt bulb.as bulb operating volage and ampacity is low.
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