1.

Two bulbs are rated 60 W, 220 V and 100 W, 220 V. Which bulb has a filament of greater resistance?

Answer»

FIRST BULB:

I=60

V=220

V=IR or R=V/I = 220 / 60=3.66 OHM


SECOND BULB:


I=100

V=220

R=V/I = 220/100=2.20 OHM


Therefore first LAMP has more RESISTANCE.



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