Question

You have 2 electric lamps having rating 40W; 220V and 60W ; 220V. Which of the two has a higher resistance? Give reasons for your answer. If these two lamps are connected to a source of 220V, which will glow brighter?​

Answer 1

Answer:

40w,220w

Explanation:

Power is inversely proportional to resistance. therefore, lesser the power, more is the resistance. so, electric lamp having 40W ,220V has higher risistance. 

P=V square/R

40=48400/R

48400/40=R

R=1210 OHM

P=V square /R

R=48400/60

R=806.6 OHM

Therefore,electric lamp having 40W, 220V has a higher resistance.

Answer 2

Answer:

It is based on P=V.V/Rconcept

Explanation:

1st question

40=220×220/R

R=1210 ohms

2nd question

60=220×220/R

R=807 ohms

Hence 40W and 220V glows bright..

Hope this helps you

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