1. 1 Chapter 1 Electric Circuit Variables

2. 2 Leyden jar for retaining electrical charges Electrical stimulation to a body History of Electrical Science Amber의 정전기 Electrical Generator Battery Positive & Negative Charge Electron vs. Ion Defibrillator

3. 3 Figure 1.3-1 A simple circuit. Charge : quantity of electricity responsible for electric phenomena Current : time rate of flow of electric charge past a given point Direct current : current of constant magnitude Time-varying current : current of varying magnitude Electric Circuits and Current Flow

4. 4 Figure 1.3-3 Current in a circuit element. Figure 1.3-4 A direct current of magnitude I. Figure 1.3-5 (a) A ramp with a slope M. (b) a sinusoid. (c) An exponential. I is a constant. The current I is zero for t<0. Electric Circuits and Current Flow

5. 5 Example 1.3-2 Example 1.3-3 Electric Circuits and Current Flow

6. 6 Figure 1.5-1 Voltage across a circuit element Figure 1.6-1 (a) The passive convention use for element voltage and current. (b) The passive convention is not used. Voltage, Power and Energy Voltage : energy required to move a positive charge from – to + Energy : capacity to perform work Power : time rate of expending or absorbing energy

7. 7 Table 1.6-1 Power Absorbed or Supplied by an Element Power and Energy

8. 8 Example 1.6-2 Example 1.6-3 Power and Energy

9. 9 Figure 1.7-1 The problem-solving method. Circuit Analysis and Design

10. 10 Figure 1.7-2 An element with a voltmeter and ammeter. Figure 1.7-3 The circuit from Figure 1.7-2 with the ammeter probes reversed. Circuit Analysis and Design Example 1.7-1

11. 11 Figure 1.9-1 An element with a voltmeter and ammeter. Jet Valve Controller