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Generally, the dish heaters heat what is in front of them (often a person or persons). However, if you have a small room and close the door, it can heat the whole room. For instance, I turn the heater on at night and close the door in my bedroom. The entire room gets warm and cozy, but, once I step out of my room, the rest of the apartment is cold. The rest of my apartment is a large room that is not enclosed so the heater would never heat so large of a space. If I step out of the beam in my large room (say I was sitting on the couch in front of the TV), the rest of the room is a lot cooler.

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Why not just use that energy consumed running the heat pump to run electric heaters inside the house and heat it directly that way?

Heat pump is more efficient. If you use electric heaters, 1 joule of electric energy will produce 1 joule of heat energy. If you use heat pumps, 1 joule of electric energy can pump several joules - perhaps up to 5 or 6, depending on the outside temperature, and the efficiency of the heat pump - of heat, from the outside to the inside.


Do heat and cold flow between objects?

Yes, heat and cold flow between objects due to the difference in temperature. Heat will flow from the hotter object to the colder object until thermal equilibrium is reached, leading to the transfer of energy.


What are the artificial sources of heat?

Sun is the primary source of heat here in the Earth. As time moves on, human developed new sources of heat and light. Some of it are the torches, lamps, candles and others


Why heat transfer to metal objects?

Heat transfers to, and from, any object, not just metal object. Metals in general are very good conductors of heat; as a result, you might feel the temperature more easily when you touch a metal object. If you get burned more easily by a metal object than by a wooden object, for example, both at the same temperature, this is a direct result of heat conduction.


What is wrong with the following statement and ldquoGiven any two objects the one with the higher temperature contains more heat. and?

The statement is incorrect because heat is a form of energy, while temperature is a measure of the average kinetic energy of particles. The amount of heat contained in an object depends on its mass and temperature, not just its temperature alone. Two objects at different temperatures can contain the same amount of heat if the object with the lower temperature has a higher mass.

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Why not just use that energy consumed running the heat pump to run electric heaters inside the house and heat it directly that way?

Heat pump is more efficient. If you use electric heaters, 1 joule of electric energy will produce 1 joule of heat energy. If you use heat pumps, 1 joule of electric energy can pump several joules - perhaps up to 5 or 6, depending on the outside temperature, and the efficiency of the heat pump - of heat, from the outside to the inside.


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