Advertisements
Advertisements
प्रश्न
A bulb lights up when connected to a battery. State the energy change which takes place :
Advertisements
उत्तर
When a bulb is connected to a battery, it lights up because of the following energy transformations:
(a) In the battery, chemical energy is transformed into electrical energy.
(b) In the bulb, electrical energy is converted into heat energy and then to light energy.
APPEARS IN
संबंधित प्रश्न
A ball of mass 0.20 kg is thrown vertically upwards with an initial velocity of 20 m s-1. Calculate the maximum potential energy it gains as it goes up.
A metal ball of mass 2 kg is allowed to fall freely from rest from a height of 5 m above the ground. Taking g = 10 m s−2, calculate:
- the potential energy possessed by the ball when it is initially at rest.
- the kinetic energy of the ball just before it hits the ground?
State whether the object possess kinetic energy, potential energy, or both :
A stretched spring lying on the ground ____________.
What is the difference between potential energy and kinetic energy?
Name the device or machine which convert :
Mechanical energy into electrical energy.
Name the device or machine which convert :
Electrical energy into heat energy.
Name the device or machine which convert :
light energy into heat energy.
Five electric fans of 120 watts each are used for 4 hours. Calculate the electrical energy consumed in kilowatt-hours.
Name the energy transfers which occur when :
an electric ball rings
An object is falling freely from a height x. After it has fallen a height `pi/2` , it will possess :
