Advertisements
Advertisements
Questions
Name the energy transfers which occur when a torch is on.
Name the energy conversion that takes place when a torch is on.
Advertisements
Solution
A torch converts the electrical energy of the battery into light and heat energy.
RELATED QUESTIONS
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.
Show that the sum of kinetic energy and potential energy (i.e., total mechanical energy) is always conserved in the case of a freely falling body under gravity (with air resistance neglected) from a height h by finding it when
- The body is at the top.
- the body has fallen a distance x.
- the body has reached the ground.
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.
What type of energy is possessed : by the piece of stone which is thrown away on releasing the stretched rubber strings of catapult?
What type of energy is possessed : by the stretched rubber strings of a catapult?
Give two examples where a body possesses both, kinetic energy as well as potential energy.
A ball of mass 0.5 kg slows down from a speed of 5 m/s so that of 3 m/s. Calculate the change in kinetic energy of the ball. State your answer giving proper units.
Name the device or machine which convert :
Electrical energy into heat energy.
Name the device or machine which convert :
Electrical energy into sound energy.
Fill in the blank with suitable word:
The electricity meter installed in our homes measure electrical energy in the units of ___________.
Fill in the blanks with suitable words:
When a ball is thrown upwards, ___________ energy is transformed into ___________ energy.
What kind of energy transformation take place at a hydroelectric power station?
Five electric fans of 120 watts each are used for 4 hours. Calculate the electrical energy consumed in kilowatt-hours.
Describe the energy changes which take place in a radio.
A bulb lights up when connected to a battery. State the energy change which takes place :
The device which converts mechanical energy into energy which runs our microwave oven is :
A microphone converts :
A girl is carrying a school bag of 3 kg mass on her back and moves 200 m on a levelled road. The work done against the gravitational force will be (g = 10 m s–2)
