A circuit has a line of 5A. how many lamps of rating 40W,220V can simultaneously run on this line safely?
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Power rating of bulb is 40watts and 220v
resistance of bulb,
R=V²/p
⇒220*220/40
⇒1210ohms
maximum voltage=220v
maximum current= 5 amp.
Maximum resistance, when 'n' no of resistances are connected in parallel.
R₁=v/I
⇒220/5
⇒44 ohms
Net resistance=R₁=r/n
⇒44=1210/n
n=27.5
so 27 bulbs we can light.
HOPE , IT HELPS ...
Power rating of bulb is 40watts and 220v
resistance of bulb,
R=V²/p
⇒220*220/40
⇒1210ohms
maximum voltage=220v
maximum current= 5 amp.
Maximum resistance, when 'n' no of resistances are connected in parallel.
R₁=v/I
⇒220/5
⇒44 ohms
Net resistance=R₁=r/n
⇒44=1210/n
n=27.5
so 27 bulbs we can light.
HOPE , IT HELPS ...
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