Advertisements
Advertisements
Question
Define 1 watt of power.
Advertisements
Solution
1 watt is the power of an agent which does 1 joule of work in 1 second.
In other words, if the rate of energy use is 1 J s-1, then the power is 1 W.
1 watt = `(1 "joule")/(1 "second")`
or 1 w = 1 Js-1
APPEARS IN
RELATED QUESTIONS
A lamp consumes 1000 J of electrical energy in 10 s. What is its power?
A load of 100 kg is pulled up by 5 m. Calculate the work done. (g = 9.8 m/s2)
A body of mass 100 kg is lifted up by 10 m. Find :
(i) the amount of work done
(ii) potential energy of the body at that height (value of g = 10 m/s2)
Define kilowatt-hour.
Fill in the blanks with suitable words :
One watt is a rate of working of one ___________ per ___________.
The power output of an engine is 3kW. How much work does the engine do in 20 s?
An electric heater uses 600 kJ of electrical energy in 5 minutes. Calculate its power rating.
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)
Which one of the following statements about power stations is not true?
How is the power related to the speed at which a body can be lifted? How many kilograms will a man working at the power of 100 W, be able to lift at a constant speed of 1 m s–1 vertically? (g = 10 m s–2)
