Advertisements
Advertisements
प्रश्न
Sumit does 600 J of work in 10 min and Amit does 300 J of work in 20 min. Calculate the ratio of the powers delivered by them.
Advertisements
उत्तर
Sumit: Work done, w1 = 600 J
Time taken, t1 = 10 min = 600 sec
Power, p1 = `w_1/t_1`
= `600/600`
= 1 W
Amit: Work done, w2 = 300 J
Time taken, t2 = 20 min = 1200 sec
Power, p2 = `w_2/t_2`
= `300/1200`
= `1/4`
= 0.25 W
∴ Ratio of Powers = `p_1/p_2`
= `1/(1/4)`
= 4 : 1
APPEARS IN
संबंधित प्रश्न
S.I. unit and commercial unit of electrical energy are same.
All electrical appliances in a household circuit work at the same voltage.
One kilowatt hour is equal to ............ joule.
The purpose of an electric meter in a house is
From where does the electricity come to our home ?
State the purpose of kWh meter.
If an appliance of power P watt is used for time t hour. How much electrical energy is consumed in kWh?
Draw a labelled diagram with the necessary switches to connect a bulb, a fan and a plug socket in a room with the mains. In what arrangement will you connect them to the mains?
Two lamps, one rated 220 V, 50 W and the other rated 220 V, 100 W, are connected in series with mains of 220 V. Explain why does the 50 W lamp consume more power.
What is the resistance, under normal working conditions, of an electric lamp rated at '240 v, 60 W' ? If two such lamps are connected in series across a 240 V mains supply, explain why each one appears less bright.
