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Electricity (static electricity (when certain insulating materials are…
Electricity
static electricity
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when 2 electrically charged objects are brought close together they exert a force on each other, this is a noncontact force and will cause objects to move if they are able to
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sparks - as the electric charge builds on an object the voltage between the object and earth increases and when the voltage gets large enough electrons can jump over the gap
everyday appliances
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the total energy transferred by an appliance depends on how long the appliance is on for and its power
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kettles transfer energy electrically from the mains ac supply to the thermal energy store of the heating element inside the kettle
energy is transferred electrically from the battery of a handheld fan to the kinetic energy store of the fans motor
national grid
national grid - a system of cables and transformers that covers the UK linking power stations to consumers
it transfers electrical power from power stations anywhere on the grid to anywhere else where its needed
step up transformers are used to increase the voltage from the power station to the transmission cables, then step down transformers are used to decrease the voltage for domestic use
efficient because it has a high voltage which decreases the current which decreases the energy lost by heating the wires and surroundings, it is also much cheaper to have a high voltage rather than high current
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