Advertisements
Advertisements
प्रश्न
A lamp consumes 1000 J of electrical energy in 10 s. What is its power?
Advertisements
उत्तर
Power = `"Energy consumed (or work done)"/"Time taken"`
W = 1000 J, t = 10 s
i.e., P = `W/t`
= `(1000 J)/(10 s)`
= 100 J/s
i.e., P = 100 W
APPEARS IN
संबंधित प्रश्न
What is power?
A battery lights a bulb. Describe the energy changes involved in the process.
What is the work done by the force of gravity on a satellite moving round the earth? Justify your answer.
Calculate the work done by the brakes of a car of mass 1000 kg when its speed is reduced from 20 m/s to 10 m/s?
Name the physical quantity whose unit is watt.
What is the power of a body which is doing work at the rate of one joule per second?
A body does 1200 joules of work in 2 minutes. Calculate its power.
A trolley is pushed along a road with a force of 400 N through a distance of 60 m in 1 minute. Calculate the power developed.
An electric heater uses 600 kJ of electrical energy in 5 minutes. Calculate its power rating.
A car of weight 20000 N climbs up a hill at a steady speed of 8 m/s, gaining a height of 120 m is 100 s. Calculate : work done by the car.
