Question

you have 2 electric lamp having rating 40w,220v and 60w, 220 which of the two has higher resistance if these two lamps are connected to a source of 220v which lamp glow brighter

Answer 1

40w 240v will glow brighter

Answer 2

Hi there!

Power is defined as, P = V²/R

Thus,
R = V²/P

For first bulb :
Power, P = 40 W

For second bulb :
Power, P = 60 W

Potential difference is same for both ( They are connected in Parallel )

♦ Resistance for first Bulb :

(220² )/40 = 1210 Ohm

♦ Resistance for second Bulb :

(220² )/60 = 806.67 Ohm

The First one has greater resistance!

Hence,
It'll glow more indicating more heat produced due to increasing Resistance.

[ Thank you! for asking the question. ]
Hope it helps!