THANK YOU in advance! 4. The figure below on left is a current phasor, a vector

Question

THANK YOU in advance!

4. The figure below on left is a current phasor, a vector rotating with angular frequency such that its vertical component gives the source current. The length of a phasor vector is the amplitude of voltage Phasor for source current Phasors for voltage drops or current. At the right are three voltage phasors marked A, B, and C. These relate to voltages Based on your responses above, identify which of the three phasors corresponds to the voltage drop across each of R, L and C in a series circuit. (The letters A, B, C are not necessarily going to correspond to the curves in the previous question). Explain your choices. For instance, which voltage phasor should line up with the current phasor because the voltage drop is proportional to current?

Explanation / Answer

The voltage drop across the resistor R has the same phase as the current. From the 2 figures, given, the phasor marked B has the same phase as the current phasor.

Hence phasor B is the voltage drop across R

The voltage drop across the inductor L leads the voltage drop across R by a certain phase. Hence, phasor A is the voltage drop across L.

The voltage drop across the capacitor C lags behind the voltage drop across R by a certain phase. Hence, phasor C is the voltage drop across C.

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