# Complete Complete Week 6 and 5 for DC Circuit Course Assignment

# ABSOLUTELY NO COPYING FROM ANOTHER SITE OR SOURCE…MUST SHOW WORK IN MICROSOFT WORD DOCUMENT…PLEASE SEPARATE EACH ASSIGNMENT…NEED A DC EXPERT

# WEEK 6

# RC and L/R Circuits

#
- Consider the series L/R circuit below:
- What is the time constant of the circuit with S1 closed?
- What is the eventual steady-state current with S1 closed?
- What is the value of the circuit current at the first instant S1 is closed? (t = 0s)
- What is the value of the circuit current exactly one time constant after S1 is closed?
- How long after S1 closes will it take before the circuit current reaches its steady-state value?

- For the same circuit, assume that the switch S1 has been closed for more than five L/R time constants. If a 1MΩ resistor is placed across the terminals of the switch, calculate:
- The approximate time constant of the circuit with S1 open.
- The peak inductor voltage V
_{L}, when S1 is opened.
- The di/dt value the instant S1 is opened.
- How long it takes for the current to decay to zero after S1 is opened (approximately).

**Series L/R Circuit:**

- Consider the series RC circuit below:
- Assume C1 is completely discharged with S1 in the position shown. If S1 is moved to the top position, how long will it take for the capacitor voltage to reach
- 3V
- 6V
- 15V
- 20V

- Assume that C is completely discharged with S1 in the position shown. If S1 is moved to the top position, how much is the resistor voltage at the following time intervals?
- t = 0 s
- t = 4.5 ms
- t = 10 ms
- t = 15 ms
- t = 25 ms

- Assume that C is fully charged with S1 in the top position. If S1 is moved to the bottom position (as shown), how long with it take the capacitor to discharge to:
- 4 V
- 8 V
- 12 V
- 18 V

**Series RC Circuit:**

- What is the time constant of the circuit with S1 closed?
- What is the eventual steady-state current with S1 closed?
- What is the value of the circuit current at the first instant S1 is closed? (t = 0s)
- What is the value of the circuit current exactly one time constant after S1 is closed?
- How long after S1 closes will it take before the circuit current reaches its steady-state value?

- The approximate time constant of the circuit with S1 open.
- The peak inductor voltage V
_{L}, when S1 is opened. - The di/dt value the instant S1 is opened.
- How long it takes for the current to decay to zero after S1 is opened (approximately).

**Series L/R Circuit:**

- Assume C1 is completely discharged with S1 in the position shown. If S1 is moved to the top position, how long will it take for the capacitor voltage to reach
- 3V
- 6V
- 15V
- 20V

- Assume that C is completely discharged with S1 in the position shown. If S1 is moved to the top position, how much is the resistor voltage at the following time intervals?
- t = 0 s
- t = 4.5 ms
- t = 10 ms
- t = 15 ms
- t = 25 ms

- Assume that C is fully charged with S1 in the top position. If S1 is moved to the bottom position (as shown), how long with it take the capacitor to discharge to:
- 4 V
- 8 V
- 12 V
- 18 V

**Series RC Circuit:**

# WEEK 5

# Series and Parallel Inductive Reactance

- Consider the series inductive reactive circuit:Calculate the following: (Express all answers in magnitude/phase angle form)
- Zeq
- I
_{T} - X
_{L2} - X
_{L1} - V
_{R1} - V
_{R2} - V
_{L1} - V
_{L2}

- Consider the parallel inductive reactive circuit:Calculate the following: (Express all answers in magnitude/phase angle form)
- Zeq
- I
_{T} - X
_{L2} - X
_{L1} - I
_{R1} - I
_{R2} - I
_{L1} - I
_{L2}