Uses of electrostatics
{"Image DocumentName": "Uses of electrostatics", "Image ImageDescription": "Electrostatic precipitators. The electrostatic precipitator is a device used in chimneys for removing dust. Spraying. Electrostatics can be useful for spraying liquids. For example: spraying paint. spraying crops with pesticides and herbicides. Spraying paint. They work because like charges repel and unlike charges attract. The spray gun is given a charge. So droplets of point become charged: They have the same charge, so repel each other producing a fine spray. The car body part is has the opposite charge. The paint droplets are attracted to the body part, producing an even coat with little waste. Defibrillators. A defibrillator is a machine that can be used by paramedics to stabilise an irregular heartbeat. They work by discharging electric charge. Two paddles with insulated handles are charged from a high voltage supply. They are put in good electrical contact with the patient s chest. It is important that only the patient gets a shock: This is why the paddles have insulating handles. The operator and any one nearby stand clear. The defibrillator passes charge through the patient to make the heart contract. Higher Tier. The metal grids in the electrostatic precipitator are given a high voltage. Depending on the design, the grids may be positively charged or negatively charged. dust particles lose electrons if the grids are positively charged. dust particles gain electrons if the grids are negatively charged. The charged dust particles then induce a charge on the earthed metal collecting plates and the dust particles are attracted to the plates. Higher Tier. The paint gun loses electrons so that it becomes positively charged. The paint droplets lose electrons and so also become positively charged. The object to be painted gains electrons and so becomes negatively charged. The positively charged paint droplets repel each other and are attracted to the negatively charged surface.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}