Advertisements
Advertisements
प्रश्न
What is the meaning of the symbol kWh? What quantity does it represent?
Advertisements
उत्तर
Kilowatt- hour (kWh) is the commercial unit of measurement of electrical energy. One-kilowatt hour can be defined as the amount of electrical energy consumed when an electrical appliance of power rating 1 kilowatt is used for 1 hour.
APPEARS IN
संबंधित प्रश्न
In what way does the temperature of water at the bottom of a waterfall differ from the temperature at the top? Explain the reason.
State the condition under which the mechanical energy is conserved.
A stone of mass 500 g is thrown vertically upwards with a velocity of 15 m/s. Calculate:
- the potential energy at the greatest height,
- the kinetic energy on reaching the ground, and
- the total energy at its half-way point.
State whether the object possess kinetic energy, potential energy, or both :
A man climbing a hill _____________.
State whether the object possess kinetic energy, potential energy, or both :
A bird running on the ground ____________.
State whether the object possess kinetic energy, potential energy, or both :
A ceiling fan in the off position ______________
What kind of energy is possessed by the following?
A stone kept on roof-top _______________
Water stored in a dam possesses :
Name the device or machine which convert :
Chemical energy into kinetic energy (or mechanical energy).
An automobile engine propels a 1000 kg car (A) along a levelled road at a speed of 36 km h–1. Find the power if the opposing frictional force is 100 N. Now, suppose after travelling a distance of 200 m, this car collides with another stationary car (B) of the same mass and comes to rest. Let its engine also stop at the same time. Now the car (B) starts moving on the same level road without getting its engine started. Find the speed of the car (B) just after the collision.
