the lamps of rating 220v,60w and 220v, 100w are connected in series across 220v supply. calculate the voltage across each lamp and power consumption. what Will be the power consumption, if the two lamps are connected in parallel.
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answer: Power, P=V
2
R
R
1
=
50
220×220
=968Ω
R
2
=
100
220×220
=484Ω
The equivalent resistance in the circuit,
R
eq
=R
1
+R
2
R
eq
=968+484=1452Ω
The current flow in the circuit,
I=
1452
440
=0.3030A
The voltage drop across bulb 1.
V
1
=iR
1
=0.3030×968=293.33V
The voltage drop across bulb 2.
V
2
=iR
2
=0.3030×484=146.65V
Bulb 1 will be fused because it can tolerate only 220 V but the voltage drop across it is 293.33V
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