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The source of solar power is energy carried by the electromagnetic waves radiated by the Sun. Most of this energy is carried by visible light and infrared (heat) radiation.
The equation for heat transfer Q is. Q = mcΔT, Q = m c Δ T, 11.7. where m is the mass of the substance and Δ T is the change in its temperature, in units of Celsius or Kelvin. The symbol c stands for specific heat, and depends on the material and phase.
Explore how heating and cooling iron, brick, water, and olive oil adds or removes energy. See how energy is transferred between objects. Build your own system, with energy sources, changers, and users. Track and visualize how energy flows and changes through your system.
The Sun is the major source of light for the earth. The sun is a massive ball of fire, at the centre of which nuclear fusion produces massive energy. This energy comes out as heat and light.
The sun is the main primary and natural source of light. Natural light sources. The moon is also natural light source. However, the moon is secondary light source, because it only reflects light of the sun. Natural light sources. Sky and clouds are also natural light source.
Heat is the flow of energy from one object to another. This flow of energy is caused by a difference in temperature. The transfer of heat can change temperature, as can work, another kind of energy transfer that is central to thermodynamics.
SOURCES AND EFFECTS OF HEAT ENERGY STUDENTS’ LEARNING OUTCOMES After studying this chapter, students will be able to: þ Describe the sources and effects of heat. þ Explain thermal expansion of solids, liquids and gases. þ Explore the effects and applications of expansion and contraction of solids.
