1. Presented by: Paawan Kohli

2. We would include History of Electric Heater About Alexander Graham Bell About Thomas Ahern About Albert Marsh Evolution Albert Marshs Heat Type of Heaters Parts of the Electric Heater Description of Parts Where else can the parts be used Pre-cautions that can be taken 3. History of Electric Heater The credit of inventing the electric heater goes to: Alexander G. Bell Thomas Ahern Albert Marsh 4. Alexander Graham Bell Alexander Graham Bell invented the electric heater. Electricity produces heat as well as light. The early electric heaters were small metal boxes that held long bulbs. The bulbs produced a comforting warm glow and heat. 5. Thomas Ahern Thomas Ahern invented the electric car heater in 1890,providing travellers some warmth for their trips. Oven, water heater, flat iron, streetcars, telegraphy, radio were invented by him. 6. Albert Marsh Albert Leroy Marsh, was an American metallurgist. In 1905 he co-invented the first metallic alloy from which a high- resistance wire could be made that could be used as a durable and safe heating element. For this invention, Marsh was acclaimed as Father of the Electrical Heating Industry. 7. Evolution The heater that Alexander G. Bell invented was: A box with high-powered light bulbs inside that radiated heat into the room. Dangerous. Inefficient at filling a room with heat. 8. Albert Marshs Heater Albert Marsh invented the chromel heating element, which was: Much more efficient and creating and dispersing heat than a light bulb. From the invention of the first heating element, electric heating took off and soon began to overtake fuel-based heat sources. In just 30 years, many new homes and businesses had central heating systems based on the original design of Albert Marsh. 9. Types of Heaters There are three major types of heaters: Radioactive Heaters Convection Heaters Fan Heaters Oil Heaters 10. Radioactive Heaters Radioactive heaters contain a heating element that reaches a high temperature. The element is usually packaged inside a glass envelope. 11. Convection Heaters In a convection heater, the heating element heats the air next to it by convection. 12. Fan Heaters A fan heater, also called a forced convection heater, is a variety of convection heater that includes an electric fan to speed up the airflow. 13. Oil Heater An oil heater, also known as an oil-filled heater, oil-filled radiator, or column heater, is a common form of convection .The oil is used as a heat reservoir (buffer), not as a fuel. 14. Disadvantages of Electric Heating High Cost Electric heaters are costly to operate. Such heaters consume considerable electricity and can raise the household electric bill extensively. 15. Outages An electric heaters cannot operate during power outages. Therefore, when you need heating most, such as during bad weather, the heater will not function. 16. Electric Shock Hazard Electric heaters are run on high voltage and can cause severe electric shock if touched, even by mistake. 17. Fire Hazard Due to excessive heat generated by electric heaters, the risk of fire is very high if proper distance is not maintained between the heater and the furniture. In worst case scenario, even the whole house can be charred. 18. Parts of the Electric Heater Tungsten WireReflector Insulator Grill 19. Parts found on Dismantling Tungsten Wire Reflector Insulator Grill 20. Description of Parts Tungsten Wire This a special kind of a wire which gives out light and heat energy when the current is passed through it. 21. Reflector A very important part, it reflects and concentrate, all the energy in a certain direction. 22. Insulator Grill This part protects you, the metal grill has a insulator covering preventing our hand from burning. 23. Where else can the parts be used In Barbeques In Ovens In Patty-Makers In filaments of bulb 24. Principle Involved Resistance- A device which opposes the flow of current through a conductor. Unit of Resistance- ohm() Formula for Resistance - R= l/A As length increases, resistance also increases. As area increases, resistance decreases. Therefore, thick wire has less resistance and thin wire has large resistance. 25. According to Joules law of heating: H(heat) is proportional to the resistance. A thick wire produces less heat. A thin wire such as bulb filament produces more heat. 26. Pre-cautions that can be taken Some parts of the heater become very hot. Children are most susceptible to accidental burns. Electric space heaters can cause accidental electric shock. Avoid using these in bathrooms, kitchens where high moisture and/or liquid spills are common. Electric heaters use a lot of electricity. Their use can easily overload circuits. 27. Source(s): www.eHow.com www.wikipedia.org www.heating-elements.com Britannica Encyclopedia