Archive for April 2012
Energy cannot be created or destroyed,but it can change from one form to another.The change of energy from one form to another is called Energy Conversion.When we eat,the food inside our body changes into chemical potential energy and then converted into kinetic energy.So,we have energy to do our activity.
Burning candle:Chemical potential energy=Light+Heat Energy
When we burn a candle the chemical potential energy is converted into light and heat energy.
Battery-operated toy car:Chemical potential energy=Electrical energy=Kinetic energy
When we switch on the button of the toy car,chemical potential energy is changed into electrical energy in the toy car and converted into a kinetic energy.So,the car can move.
Paper airplane:Chemical potential energy=Kinetic energy
When we throw a paper airplane a chemical potential energy from the food we eat is converted into a kinetic energy when we throw the airplane.So,the airplane can fly.
Recorder:Chemical potential energy=kinetic energy=sound energy
When we blow a recorder chemical potential energy is given out and converted into a kinetic energy.The kinetic energy then is transferred to the holes on the recorder and produces sound energy when it vibrates.
Guitar:chemical potential energy=kinetic energy=sound energy
When we play a guitar chemical potential energy is given out and converted into a kinetic energy.The kinetic energy then is transferred to the strings of the guitar and produces sound energy when it vibrates.
Electrical appliances:
Television:Electrical energy=light energy+sound energy+heat energy
When we turn on a televison,electrical energy is produced.Then,sound and light energy is produced.At the end,heat energy is also produced but its not useful.
Speaker:Electrical energy=sound energy
When we turn on a speaker,electrical energy is produced.Then,a sound energy is also produced.Now,we can hear the songs that we like from the recorder.
Electrical Fan:Electrical energy=Kinetic+Heat energy
When we turn on an electrical fan it produces an electrical energy.Then,the a kinetic energy is produced when the electrical motor of the fan is working and the blades moves.A heat energy is produced when the electrical motor is getting hotter.
Burning candle:Chemical potential energy=Light+Heat Energy
When we burn a candle the chemical potential energy is converted into light and heat energy.
Battery-operated toy car:Chemical potential energy=Electrical energy=Kinetic energy
When we switch on the button of the toy car,chemical potential energy is changed into electrical energy in the toy car and converted into a kinetic energy.So,the car can move.
Paper airplane:Chemical potential energy=Kinetic energy
When we throw a paper airplane a chemical potential energy from the food we eat is converted into a kinetic energy when we throw the airplane.So,the airplane can fly.
Recorder:Chemical potential energy=kinetic energy=sound energy
When we blow a recorder chemical potential energy is given out and converted into a kinetic energy.The kinetic energy then is transferred to the holes on the recorder and produces sound energy when it vibrates.
Guitar:chemical potential energy=kinetic energy=sound energy
When we play a guitar chemical potential energy is given out and converted into a kinetic energy.The kinetic energy then is transferred to the strings of the guitar and produces sound energy when it vibrates.
Electrical appliances:
Television:Electrical energy=light energy+sound energy+heat energy
When we turn on a televison,electrical energy is produced.Then,sound and light energy is produced.At the end,heat energy is also produced but its not useful.
Speaker:Electrical energy=sound energy
When we turn on a speaker,electrical energy is produced.Then,a sound energy is also produced.Now,we can hear the songs that we like from the recorder.
Electrical Fan:Electrical energy=Kinetic+Heat energy
When we turn on an electrical fan it produces an electrical energy.Then,the a kinetic energy is produced when the electrical motor of the fan is working and the blades moves.A heat energy is produced when the electrical motor is getting hotter.
