1. Chapter 8
DC Circuits

2. Objectives After completing this chapter, you will be able to:
Solve for all unknown values (current, voltage, resistance, and power) in a series, parallel, or series-parallel circuit
Understand the importance of voltage dividers
Design and solve for all unknown values in a voltage-divider circuit

3. Series Circuits
In a series circuit:

4. Series Circuits (cont’d.)
Figure 8-1. Series circuit.

5. Series Circuits (cont’d.)
In a series circuit:

6. Parallel Circuits
In a parallel circuit:

7. Parallel Circuits (cont’d.)
In a parallel circuit (cont’d.):

8. Series-Parallel Circuits
Series formulas are applied to the series part of the circuit
Parallel formulas are applied to the parallel part

9. Voltage Dividers
Sets the bias or operating point of active electronic components
Also used in scaling

10. Voltage Dividers (cont’d.)
Figure Simple circuit.

11. Voltage Dividers (cont’d.)
Figure Simple voltage divider.

12. Voltage Dividers (cont’d.)
Figure Voltage divider.

13. Voltage Dividers (cont’d.)
Figure Voltage divider application.

14. Voltage Dividers (cont’d.)
Figure Real-world voltage divider.

15. Figure 8-17. Analyzing the circuit.

16. Voltage Dividers (cont’d.)
Figure Determining the resistor values.

17. Wheatstone Bridge
Figure A Wheatstone bridge consists of two voltage dividers.

18. Summary
The most commonly used circuits are the series, parallel, and series-parallel circuits
Voltage dividers sets the bias of active electronic components
A Wheatstone bridge measures unknown electrical resistance