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Aut 241 Auto Electricity and ElectronicsPowerPoint Presentation

Aut 241 Auto Electricity and Electronics

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Aut 241Auto Electricity and Electronics

- Series – Parallel Circuits
- Chapter 7

SERIES-PARALLEL CIRCUITS

- Series-parallel circuits are a combination of series and parallel segments in one complex circuit.
- A series-parallel circuit includes both parallel loads or resistances, plus additional loads or resistances that are electrically connected in series.

SERIES-PARALLEL CIRCUITS

- A circuit where the load is in series with other loads is parallel.

FIGURE 7-1 A series-parallel circuit.

SERIES-PARALLEL CIRCUITS

- A circuit where a parallel circuit contains resistors or loads are in series in one or more branches.

This complete headlight circuit with all bulbs and switches is a series-parallel circuit.

SERIES-PARALLEL CIRCUITSSeries-Parallel Circuit Faults

- If a conventional parallel circuit, such as a taillight circuit, had an electrical fault that increased the resistance in one branch of the circuit, then the amount of current flow through that one branch will be reduced.

SOLVING SERIES-PARALLEL CIRCUIT PROBLEMS

- The key to solving series-parallel circuit problems is to combine or simplify as much as possible.

Solving a series-parallel circuit problem.

SERIES-PARALLEL CIRCUITEXAMPLES

- Each of the four examples includes solving for the following:
- Total resistance
- Current flow (amperes) through each branch, as well as total current flow
- Voltage drop across each resistance

SERIES-PARALLEL CIRCUITEXAMPLES

SERIES-PARALLEL CIRCUITEXAMPLES

SERIES-PARALLEL CIRCUITEXAMPLES

SERIES-PARALLEL CIRCUITEXAMPLES

SUMMARY

- A series-parallel circuit is called a compound circuit or a combination circuit.
- A series-parallel circuit is a combination of a series and a parallel circuit, which does not include fuses or switches.
- A fault in a series portion of the circuit would affect the operation if the series part was in the power or the ground side of the parallel portion of the circuit.
- A fault in one leg of a series-parallel circuit will affect just the component(s) in that one leg.

REVIEW QUESTIONS

- Explain why an increase in resistance in the series part of a series-parallel circuit will affect the current (amperes) through the parallel legs (branches).
- What would be the effect of an open circuit in one leg of a parallel portion of a series-parallel circuit?
- What would be the effect of an open circuit in a series portion of a series-parallel circuit?

CHAPTER QUIZ

- Half of the dash is dark. Technician A says that a defective dash light dimmer can be the cause because it is in series with the bulbs that are in parallel. Technician B says that one or more bulbs could be defective. Which technician is correct?
- Technician A only
- Technician B only
- Both Technicians A and B
- Neither Technician A nor B

CHAPTER QUIZ

2. All brake lights are dimmer than normal. Technician A says that bad bulbs could be the cause. Technician B says that high resistance in the brake switch could be the cause. Which technician is correct?

- Technician A only
- Technician B only
- Both Technicians A and B
- Neither Technician A nor B

CHAPTER QUIZ

3. See Figure 7-8 to solve for total resistance (RT) and total current (IT).

- 10 ohms ÷ 1.2 A
- 4 ohms ÷ 3 A
- 6 ohms ÷ 2 A
- 2 ohms ÷ 6 A

CHAPTER QUIZ

4. See Figure 7-9 to solve for the value of R3and total resistance (RT).

- 12 ohms ÷ 12 ohms
- 1 ohm ÷ 7 ohms
- 2 ohms ÷ 8 ohms
- 6 ohms ÷ 6 ohms

CHAPTER QUIZ

5. See Figure 7-10 to solve for voltage (E ) and total resistance (RT).

- 16.3 volts ÷ 12 ohms
- 3.3 volts ÷ 2.4 ohms
- 1.36 volts ÷ 1 ohm
- 6 volts ÷ 4.4 ohms

CHAPTER QUIZ

6. See Figure 7-11 to solve for R1 and total resistance (RT).

- 3 ohms ÷ 15 ohms
- 1 ohm ÷ 15 ohms
- 2 ohms ÷ 5 ohms
- 5 ohms ÷ 5 ohms

CHAPTER QUIZ

7. See Figure 7-12 to solve for total resistance (RT) and total current (I ).

- 3.1 ohms ÷ 7.7 amperes
- 5.1 ohms ÷ 4.7 amperes
- 20 ohms ÷ 1.2 amperes
- 6 ohms ÷ 4 amperes

CHAPTER QUIZ

8. See Figure 7-13 to solve for the value of E and total resistance (RT).

- 13.2 volts ÷ 40 ohms
- 11.2 volts ÷ 34 ohms
- 8 volts ÷ 24.2 ohms
- 8.6 volts ÷ 26 ohms

CHAPTER QUIZ

9. See Figure 7-14 to solve for total resistance (RT) and total current (I ).

- 1.5 ohms ÷ 8 amperes
- 18 ohms ÷ 0.66 ampere
- 6 ohms ÷ 2 amperes
- 5.5 ohms ÷ 2.2 amperes

CHAPTER QUIZ

10. See Figure 7-15 to solve for total resistance (RT) and total current (I ).

- 48 ohms ÷ .42 ampere
- 20 ohms ÷ 1 ampere
- 30 ohms ÷ .66 ampere
- 10.2 ohms ÷ 1.96 amperes

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