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A few examples of heat sources are the sun, friction, chemical reactions and the earth. The sun is a natural heat source that is renewable and that can be converted into electricity.


Examples of heat energy include electrical stoves, hairdryers, a just-sharpened pencil and sun rays. Heat, or thermal energy, is typically converted from mechanical, electrical or chemical energy.


An example of a high specific heat is water’s specific heat, which requires 4.184 joules of heat to increase the temperature of 1 gram of water 1 degree Celsius. Scientifically, water’s specific heat is written as: 1 calorie/gm °C = 4.186 J/gm °C.


A heat pump is the most cost-effective option for home heating, but it is important for homeowners to ensure that the pump is installed correctly to ensure efficient heat production. Heat pumps utilize outside air to heat homes in the winter and cool homes in the summer...


Some examples of primary sources include diaries, personal letters, speeches and first-hand newspaper reports. Creative works such as novels and poems are primary sources, as are multimedia sources such as photographs or videos of a given event. Numerical data and resea...


To qualify as a primary source, the object or document must have been written or created during the time period studied. Primary sources are created by eyewitnesses and offer direct evidence. A diary, such as The Diary of Anne Frank, is an example of a primary source.


An air-source heat pump is an energy-efficient heating and cooling unit for the home that performs best in areas with sub-freezing winter temperatures. The device works by transferring heat from the air rather than converting it from fuel.