10 C

• AC circuit analysis

  Apply circuit laws and rules in ac analysis<|>Use rms values in voltage and current calculations<|>Determine the resultant waveform of superimposing ac and dc components
• All circuit laws and rules apply to ac circuits in the same way they apply to dc circuits
• For an ac circuit, all ac voltages and currents are in rms values unless otherwise specified
• Example 1: Determine the voltage drops across each resistor and the circuit current

  1. Find total resistance RT

  2. Apply Ohm's law to find current I

  3. Voltage drop across R1, V1 = I x R1

  4. Voltage drop across R2, V2 = I x R2

  5. Can also apply VDR to find voltage drops
• Superimposed dc and ac voltages


  In many circuit practices, you will find both ac and dc voltages combined
• Case 1: If Vdc > Vp


  1. Vmax = Vdc + Vp

  2. Vmin = Vdc - Vp

  3. Sine wave does not reverse its polarity and is non-alternating

  4. A dc offset sine wave
• Case 2: If Vdc < Vp


  Sine wave is negative during certain portion of its lower half-cycle and is alternating
• You have learned that: