Q. calculate the value of the resistor to be connected in series with a 100W;
230V lamp so that the wattage of the lamp is reduced to 35W
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Answer Posted / 230
power = 100 W,= VI
volts = 230v,
I=V/P;
I=100/230;
=0.4347;
R=V/I;
=230/0.4347;
I=529.1,
NEXT POWER REDUCED TO 35 MEANS, 2.8* R;
=2.85*529.1;
=1507.9 Ohms.
That is 1507.9 Ohms to be increased to get 35 W
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