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| == Voltage sources – batteries and generators == | | == Voltage sources – batteries and generators == |
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− | [[File:Electromagnetism_%20Resource_Material_Subject_Teacher_Forum_September_2011_html_bb112d6.png]]A | + | [[File:CurrentElecticity1.png|left]] |
− | battery or a generator does work to pull electrons from positive | + | A battery or a generator does work to pull electrons from positive |
| charges. In a battery, this is done using chemical reactions; where | | charges. In a battery, this is done using chemical reactions; where |
| the energy of the chemical bonds is converted into electrical energy. | | the energy of the chemical bonds is converted into electrical energy. |
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| induction. | | induction. |
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− | [[File:Electromagnetism_%20Resource_Material_Subject_Teacher_Forum_September_2011_html_70ab754b.jpg]] | + | [[File:CurrentElecticity2.jpg]] |
| The cell shown here uses dilute sulphuric acid as | | The cell shown here uses dilute sulphuric acid as |
| the electrolyte. One of the electrodes is carbon ; the other is | | the electrolyte. One of the electrodes is carbon ; the other is |
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| after a while, all the zinc will dissolve and the cell will be dead. | | after a while, all the zinc will dissolve and the cell will be dead. |
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| == Electrical resistance == | | == Electrical resistance == |
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