You have two electric lamps having rating 40 W 220 V and 60 W, 220 V. Which of the higher resistance? Give reason for your answer. If these two lamps are connected to a source of 220 V, which will glow brighter?
The function of resistance is to oppose the flow of electric current. If these two lamps are connected to a source of 220 V, then the lamp having less resistance will glow brighter i.e, lamp 2
Power is inversely proportional to resistance. therefore, lesser the power, more is the resistance. so, electric lamp having 40W ,220V has higher resistance.
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
Answers & Comments
Answer:
Power of first lamp, P1 = 40W
Power of other lamp, P2 = 60W
Voltage of first lamp, V1 = 220V
Voltage of other lamp, V2 = 220 V
We know that,
Power of an electrical appliances = P = (V²)/R
∴ For first lamp:
R1 = (V1²)/ P1
R1 = (220V)² / (40W)
R1 = 1210 ohms
∴ For second lamp :
R2 = (V2²)/ P2
R2 = (220V)² / (60W)
R2 = 806.6 ohms
∴ The resistance of first lamp is high
The function of resistance is to oppose the flow of electric current. If these two lamps are connected to a source of 220 V, then the lamp having less resistance will glow brighter i.e, lamp 2
Explanation:
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Verified answer
Answer:
Power is inversely proportional to resistance. therefore, lesser the power, more is the resistance. so, electric lamp having 40W ,220V has higher resistance.
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
Explanation:
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