What energy transformation takes place in?
The first law of thermodynamics:
|Scenario||Energy conversions involved|
|Using a battery-powered flashlight||Chemical energy to electrical energy (in the battery) Electrical energy to radiant energy (in the bulb)|
|An object speeding up as it falls||Gravitational potential energy to kinetic energy|
How does a refrigerator transfer thermal energy?
A refrigerator transfers thermal energy from the cool air inside the refrigerator to the warm air in the kitchen. Thermal energy normally moves from a warmer area to a cooler area, so a refrigerator must do work to reverse the normal direction of heat flow.
How does transformation of energy take place in this machine?
Answer: In AC generators, mechanical energy is transformed into electrical energy as the coil rotates within the magnetic field. In DC motors, electrical energy is converted into mechanical energy.
What type of energy does a refrigerator use?
Refrigerators use electricity, which is then turned into kinetic energy by fans. Refrigerators are machines that work on the principle of removing…
How does refrigerator work?
Refrigerators work by causing the refrigerant circulating inside them to change from a liquid into a gas. This process, called evaporation, cools the surrounding area and produces the desired effect. … When you release the contents into the lower pressure open space, it turns from a liquid to a gas.
On what principle does refrigerator works?
According to the second law of thermodynamics: “It is impossible for a self-acting machine unless energy is provided by any external agency, to transfer heat from a body having lower temperature to another at a higher temperature“. This is the basic principle used for the working of a refrigerator.
Why is a refrigerator called a thermal energy mover?
A device that uses electric energy to transfer thermal energy from a cooler location to a warmer location is called a refrigerator. Recall that thermal energy naturally flows from a warmer area to a cooler area. A refrigerator does the opposite. It moves thermal energy from from its cold inside to the warm air outside.
Is a refrigerator conduction convection or radiation?
A refrigerator has many features which lower conduction, radiation and convection energy transfer to reduce the consumption of electrical energy. … The thick walls and doors of the refrigerator are also well-insulated to reduce heat transfer through conduction.
Is a refrigerator endothermic or exothermic?
This endothermic process causes the Freon to absorb heat from the air inside the refrigerator, cooling the refrigerator.