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amber ammeter Andre-Marie Ampere atmosphere atoms attraction balloon battery become magnetised British scientist cables called carbon-dioxide cause cloud coil compass needle components conductor copper wire core create current electricity developed world devices displavs Earth's electromagnetic field Earth's magnetic field electric cell electric charge electric circuit electric current electric current flows electric signal electricitv supplv electricity and magnetism electricity supplv electromagnetic field Electromagnetic signals electromagnetic spectrum electromagnetic waves electrons fossil fuels German scientist heat homes human infrared radiation insulated invention iron filings kilometres per hour light bulb Maglev trains magnet stone metal microchip microcircuits million mobile phones Nanobots nanometre Nanotechnology negative terminal negatively charged non-renewable parallel circuit particles permanent magnets positive terminal positively charged power stations produce electricity radio waves repel rubbed satellite scanner series circuit short circuits silicon solar south pole static electricity steel supply switched television thev tiny turbines voltaic pile voltmeter ydu kndw