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NEL 10.1 Light Energy and Its Sources 291 Thermal energy can heat a metal to such a high temperature that it emits light. This light ranges from dull red to yellow to white and blue-white as the metal gets hotter. The colour of the emitted light indicates when the molten metal is ready to be poured. Light from Phosphorescence
identify conventional and non-conventional sources of energy used in India; distinguish between renewable and non-renewable sources of energy; describe various types of sources of energy e.g. fossil fuels, water, wind, biomass, sea, geothermal, nuclear energy; recognise that the sun is the ultimate source of energy;
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.
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.
Some light bulbs get hot and are a heat source. You can use the temperature sensor to measure the amount of heat given off by a light bulb. Some light bulbs are energy efficient. Energy efficient bulbs emit light, but lose very little heat, so they are not a heat source.
After completing this chapter, you will be able to: Explain that energy provides the ability to do work and can exist in different forms. Identify different forms of energy with examples. Differentiate between kinetic and potential energy. Demonstrate how one form of energy can be converted into other form of energy.
Thermal Energy and Heat. Thermal energy is the energy of an object due to the random motion of its. particles. The faster the particles move, the greater the thermal energy, and the greater the temperature. Heat energy is thermal energy that is transferred from warmer objects to colder objects.
