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प्रश्न
Name the energy transfers which occur when a torch is on.
Name the energy conversion that takes place when a torch is on.
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उत्तर
A torch converts the electrical energy of the battery into light and heat energy.
संबंधित प्रश्न
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.
A pendulum is oscillating on either side of its rest position. The correct statement is:
Is energy a vector quantity?
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 running car ____________
Fill in the blank with suitable word :
The sum of the potential and kinetic energies of a body is called __________ energy.
What type of energy is possessed : by the stretched rubber strings of a catapult?
A boy weighing 40 kg makes a high jump of 1.5 m.
What is his potential energy at the highest point? (g = 10 m/s2)
What are the various forms of energy?
Two bodies having equal masses are moving with uniform speeds of v and 2v respectively. Find the ratio of their kinetic energies.
Name the device or machine which convert :
Chemical energy into heat energy.
Fill in the blanks with suitable words:
When a ball is thrown upwards, ___________ energy is transformed into ___________ energy.
Fill in the blanks with suitable words :
The principle of ___________ of energy says energy can be transformed from one form to another, but it cannot be ___________ or ___________.
Five electric fans of 120 watts each are used for 4 hours. Calculate the electrical energy consumed in kilowatt-hours.
A bulb lights up when connected to a battery. State the energy change which takes place :
What do you understand by the term 'transformation of energy"? Explain with an example.
How much energy does a 100 W electric bulb transfer in 1 minute?
