Impedance formula (part 1) explained and transposed 

Lay out your revision page on impedance formula exactly like this. Formula needed to calculate impedance questions, explained, transposed all ways, what each letter stands for and each SI unit of measure given.
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BS7671 18th Edition amendment 2
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On - Site Guide 18th Edition amendment 2
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Casio Scientific Calculator
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Multi coloured pen
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15cm ruler
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30cm ruler
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Folding ruler
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