In an RC series circuit driven by a sinusoidal source, which steps correctly determine the magnitude of the resistor voltage using phasors?

• A. Compute Z_C = 1/(j ω C); Z_total = R + Z_C; I = V / Z_total; V_R = I × R; |V_R| equals |I| × R and phase from I.
• B. Assume the resistor voltage is V_R = V × R / Z_total.
• C. V_R is equal to V divided by R.
• D. V_R = V - I Z_total.

Answer: (A)