A 100W, 110V filament lamp is to be operated on a 230v DC supply. Determine the value of resistance to be connected in series with lamp.
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Explanation:
Resistance of lamp R=
P
V
2
Resistance of 100 watt-110-volt lamp R
1
=
100
110
2
=121 Ω
Resistance of 50 watt-110volt lamp R
2
=
50
110
2
=242 Ω
Series connection :
Voltage across 100 watt lamp, V
1
=
R
1
+R
2
R
1
V=
121+242
121
×100=33.33 volts
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