Chapter 1 Electric Circuit Variables
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Transcript of Chapter 1 Electric Circuit Variables
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Chapter 1
Electric Circuit Variables
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Leyden jar for retaining electrical charges Electrical stimulation to a body
History of Electrical Science
• Amber 의 정전기• Electrical Generator• Battery• Positive & Negative Charge• Electron vs. Ion• Defibrillator
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Figure 1.3-1A 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
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Figure 1.3-3Current in a circuit element.
Figure 1.3-4A 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
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Example 1.3-2
Example 1.3-3
Electric Circuits and Current Flow
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Figure 1.5-1Voltage 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
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Table 1.6-1Power Absorbed or Supplied by an Element
Power and Energy
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Example 1.6-2
Example 1.6-3
Power and Energy
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Figure 1.7-1The problem-solving method.
Circuit Analysis and Design
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Figure 1.7-2An element with a voltmeter and ammeter.
Figure 1.7-3The circuit from Figure 1.7-2 with the ammeter probes reversed.
Circuit Analysis and Design
Example 1.7-1
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Figure 1.9-1An element with a voltmeter and ammeter.
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