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| 16297831594 | how can an insulator become charged using friction? | When you rub an acetate rod with a dry duster some of the electrons move from the acetate onto the duster. Since electrons are negatively charged, the duster gains a negative charge and this leaves the acetate rod with a positive charge. | 0 | |
| 16297853849 | like charges | repel | 1 | |
| 16297859200 | unlike charges | attract | 2 | |
| 16297890995 | static electricity | unbalanced electric charges on the surface or within a material | 3 | |
| 16297931982 | charging by induction | 1) if a negatively charged balloon is brought near a wall, the negatively charged electrons in the wall are repelled. 2) this causes the surface of the wall to become positively charged. No charges are transferred from the balloon and so we say that the positive charge on the wall has been induced |  | 4 |
| 16297979538 | shocks from everyday objects | 1) when you walk across some types of carpet, you may end up with an unbalanced electric charge 2) if you then touch a conductor, such as a metal tap, electrons will flow between the tap and you and you may feel a small electric shock 3) the electrons flow in whichever direction removes the excess charge and you become discharged or earthed | 5 | |
| 16298007615 | lightning | 1) static electricity builds up in clouds due to friction between particles of ice or water moved by air currents 2) when the charge is large enough, charged particles travel through the air between the cloud and the earth 3) this causes both lightning and thunder | 6 | |
| 16298040228 | lighting conductor | a thick metal rod running down from the top of a building into the earth which discharges the clouds and earths the building | 7 | |
| 16298118539 | earthed | connected to earth so that any electrostatic charges can flow away | 8 | |
| 16298110598 | dangers of sparking | 1) sparks can be dangerous, for example when there is fuel vapour that could ignite 2) this can be a problem for refuelling aircraft, which often become charged when flying through the air - a charge can also build up when fuel flows through a pipe 4) to prevent a spark between a fuel pipe and an aircraft, a 'bonding line' is connected to earth the aircraft before refuelling begins | 9 | |
| 16298289699 | uses of electrostatic charges | insecticide sprays - when spraying crops with insecticide, electrodes on the spray nozzle charge the spray droplets as they pass. - the charged droplets spread out because they repel each other and then they are attracted to the plants by induction | 10 | |
| 16298316604 | pros of using insecticide spray | - the spray spreads around the plant, even underneath it - less spray falls on the ground - farmers don't need to use as much | 11 | |
| 16298340263 | electric field | the space around an object with a charge of static electricity where it can affect other objects |  | 12 |
| 16298475272 | electric field between parallel plates |  | 13 | |
| 16298493951 | field lines | lines of force that are formed in a magnetic field - never cross - show where the field is strongest - show the direction of the force on a charge in a field - start on a positively charged object | 14 |
