lightning-rod(避雷针).ppt

When/where can you find electricity? Fill in the blanks Is ________ electricity ? Benjamin Franklin thought for a long time. One day he ________ a kite in the storm. Something in the wire gave him a _______ . He discovered the electricity.Some years later,he invented the lightning-rod（避雷针） to prevent the ________ crashing the high buildings. After the lightning _______ ,we can hear the thunder _______. Although electricity is __________ ,it is very important to us. * pylons, wires lightning lamps switches plugs lights lightning flew fright thunder flashes crashes dangerous Who proved that lightening is a natural form of electricity? What electrical appliances do people usually use at home / at school / in offices? Electricity gives power for… a heater a fan an iron a microwave an oven a printer Electricity gives power for… an air conditioner a blender a CD player a computer a cooker a hair dryer a lamp a kettle Electricity gives power for… a recorder a refrigerator a TV set a vacuum cleaner a video player a washing machine Think: Why has electricity become so important in our lives? It is because people want to… Think again and answer: If there is no electricity, what will our life be like? The importance of electricity Electricity has become very __________ to us. It is because people want to ________ many different _________ _________. People usually use … at home. People usually use … at school. People usually use… in offices. Air conditioners and heaters make us _______ more _________ in _______ and _______. Televisions and ____________ make our lives more enjoyable. Lights and microwaves make ______ ______ more convenient. Computers and ________ help us work more efficiently. _______ ________ and _______ _______ can save us time doing housework. important use Electrical appliances feel comfortable summer winter our lives printers Washing machines vacuum cleaners video players *