Advertisement Remove all ads
Advertisement Remove all ads
Sum
Two electric bulbs rated 100 W; 220 V and 60 W; 220 V are connected in parallel to electric mains of 220 V. Find the current drawn by the bulbs from the mains.
Advertisement Remove all ads
Solution
Firstly calculating the resistance of the electric bulbs,
P=`"V"^2/"R"`
⇒ `"R"="V"^2/"P"`
⇒ `"R"_1 =220^2/100 =484 Ω`
⇒ `"R"_2=220^2/60=2420/3 Ω`
`"R"_"eq" = ("R"_1"R"_2)/("R"_1+"R"_2)=(484xx(2420//3))/(484+(2420//3))=302.5Ω`
Total current drawn by the bulbs from the mains supply,
`"I"=220/302.5=0.73 "A"`
Concept: Electric Current
Is there an error in this question or solution?
Advertisement Remove all ads
APPEARS IN
Advertisement Remove all ads