Advertisements
Advertisements
प्रश्न
Define power. Give the SI unit of power.
Advertisements
उत्तर
Power is defined as rate of doing work. It is also defined as rate at which energy is consumed. SI unit of power is watt.
APPEARS IN
संबंधित प्रश्न
Define average power.
A battery lights a bulb. Describe the energy changes involved in the process.
An electric heater is rated 1500 W. How much energy does it use in 10 hours?
A load of 100 kg is pulled up by 5 m. Calculate the work done. (g = 9.8 m/s2)
How much is the mass of a man if he has to do 2500 joules of work in climbing a tree 5 m tall? (g = 10 m s−2)
Fill in the blanks with suitable words :
One watt is a rate of working of one ___________ per ___________.
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.
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 : power of engine of car.
A boy weighing 40 kg carries a box weighing 20 kg to the top of a building 15 m high in 25 seconds. Calculate the power. (g = 10 m/s2)
In loading a truck, a man lifts boxes of 100 N each through a height of 1.5 m.
If the man lifts 4 boxes per minute, at what power is he working?
(g = 10 m s−2)
