two bulbs rated 100 w is at 220 V and 200 w at 220 V are connected in parallel to a 220 V line .What total current is drawn by them?
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Answered by
2
Explanation:
From Joule's Law of heating,
P=V
2
/R
For first lamp,
R
1
=220
2
/100
For second lamp,
R
2
=220
2
/60
When they are connected in parallel,
R
eq
1
=
R
1
1
+
R
2
1
=
220
2
/100
1
+
220
2
/60
1
⟹R
eq
=220
2
/160
From Ohm's Law,
V=IR
eq
220=
160
220
2
I
I=0.73 A
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