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| AC Circuit Containing Resistance only |
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| Let an AC source of EMF E be connected to a pure resistance R. The instantaneous EMF from the source is given by |
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| E = Eo sin wt |
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| From Ohm's law |
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| I = E/R = Eo/R . sin wt |
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| I = Io sin wt |
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| The variation of E and I shows that both reach maximum and zero value at the same instant of time. We therefore say the current is in phase with applied voltage. |
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| The time varying quantities E and I can be represented geometrically by phasors. |
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