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|[[File:OscilloscopeScreenAC1.png|center|400px]]
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| style="height:20px; width:600px; text-align:center;" |An [[oscilloscope]] trace of '''[[Mains Electricity|mains electricity''' ]] shows its [[frequency]] is 50Hz as the time [[period]] is 0.02s per oscillation and the peak [[Potential Difference|potential difference]] is 320V, but the [[Mean Average|average]] over time is 230V.
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