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27 Cards in this Set
- Front
- Back
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the force that moves electrons
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voltage
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usually represented by the capital letter E
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voltage
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the electrical unit used to express voltage
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volt
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The unit volt is abbreviated with the letter
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V
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electrical pressure potential, potential difference, or electromotive force (emf)
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different ways to express voltage
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the flow of electrons
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current
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basic unit of current
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amp or ampere
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the amount of electrons flowing past any given point in one second
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amp or ampere
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unit symbol for the amp or ampere
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A
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the amp is expressed using the letter
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I
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flows in one direction through an electrical circuit
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direct current
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example of direct current
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battery
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the opposition to the flow of electrons
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resistance
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Resistance is measured in
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ohms
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electrical symbol for ohms
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Ω
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present in all conductors
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resistance
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permits the the free flow of electrons
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conductor
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essentially infinite in insulators
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resistance
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Extremely poor conductors
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insulators
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useful to control the flow of current
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resistance
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material that limits the flow of free electrons and is not considered to be a good conductor or good insulator
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semiconductors
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amount of work done based on a time period
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power
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used for stating mechanical power
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horsepower
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work rate of 550 ft.-lb / second
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horsepower
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electrical unit of power
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watt
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unit symbol for the watt
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W
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746 watts
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1 horsepower
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