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What is the function of the shiny part behind the coils in a heater?
Electric room heaters are provided with a curved,polished surface behind the rod like heating element. this polished surface reflects back all the heat radiations falling on it ,concentrating it on forward direction.so that we feel even the heat even if stand a few feet away from the heater.
Why are room heaters silver and shiny?
it is because metal is a good conductor of heat. thus, the heator would provide heat only when it comes contact with electricity (current. )
Why do heaters have polished reflectors?
Explanation:Room heaters have polished reflectors because bright ,polished reflectors reflect heat more efficiently and hence more heat is generated in front of the heater ,at the same time since they reflect heat the appliance or the unit is saved from getting heated or catching fire.
Why do room heaters have a shiny metal surface?
Answer. Coils of room heater have shining coverd metal surfaces to radiate the maximum amount of heat possible with the current structure of its radiator.
Why is the surface of the heater curved?
The function of the polished curved surface at the back of the heating rod in a room heater is to reflect the radiation produce by the heating rod and improve the heating effect………..
Why the electric room heaters are provided with a curved polished surface behind the heating element?
Electric room heaters are provided with a curved, polished surface behind the rod-like heating element. This polished surface reflects back all the heat radiation falling on it, concentrating it in the forward direction, so that we feel the heat even if we stand a few feet away from the heater.
Why do room heaters have polished reflectors Class 7?
Answer: Since, the shiny surface absorbs very little heat due to which the reflectors reflect all the heat which makes the room heaters more effective. So, due to this reason, room heaters have shiny reflectors.
Why are room heaters provided with curved polished metal reflectors behind the heating elements?
What are the convection process?
Convection is the process of heat transfer by the bulk movement of molecules within fluids such as gases and liquids. The initial heat transfer between the object and the fluid takes place through conduction, but the bulk heat transfer happens due to the motion of the fluid. It happens in liquids and gases.
What do you mean by heat Class 7?
CBSE Class 7 Science Notes Chapter 4 Heat. Heat is a form of energy which makes the substance hot. In winter, it is our common experience that we feel cold inside the house and if we come out in front of sun rays, then we feel warm.
What are the effects of heat Class 7?
Answer: On heating, gases expand the most. Because the molecules of gases are not bound to each other, the vibration of molecules increases when gases are heated. This increases the average distance between the molecules, resulting in their expansion.
Why concave reflectors are used in room heaters?
The concave reflector, reflects the heat radiations in the forward direction. Thus, large amount of heat radiations are available in one particular direction.