How is a vector diagram for a circuit consisting of a series-connected resistor, coil and capacitor constructed?

The vector depicting the amplitude of the voltage U coincides in direction with the vector depicting the amplitude of the current strength 1 The voltage fluctuations on the capacitor lag in phase by n / 2 from the current fluctuations, therefore the vector depicting U lags behind the vector depicting l by an angle of 90 °. The voltage fluctuations on the coil are ahead of the phase current fluctuations by n / 2, so the vector representing U is ahead of the vector representing I by an angle of 90 °.

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