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15 Cards in this Set
- Front
- Back
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What device is used to step up or down A/C voltage?
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A transformer
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What is a Waveform?
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The voltage pattern which results when these changes in amplitude.
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WHat does an electrical current always produce?
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magnetism
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What is involved in the most common way to produce electricity?
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magnetism
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What two conductors do if they are parallel and adjacent and are carrying current in the same direction or opposite direction?
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Same: Aid
Opposite: Repel |
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What are the main factors that determine the strength or intensity of a coil's magnetic field?
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- The number of turns of wire in the coil
- The amount of current flowing in the coil - The ratio of the coil length to the coil width - The type of material in the core |
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What do atoms do when current flows in a conductor?
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They all line up in a definite direction producing a magnetic field.
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What is hysteresis loss?
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The loss of power when atoms change direction in current.
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What is one cycle?
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Two alternations or one complete rotation of a conductor through the magnetic field between two poles of a permanent magnet.
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How is hertz measured?
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In seconds (i.e. 100 cycles per second is equal to 100 hertz)
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What is frequency?
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The number of complete cycles of A/C current or voltage completed each second
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What is positive alternation?
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The variation which occurs during the time the voltage is positive
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What is negative alternation?
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The variation which occurs during the time the voltage is negative
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What is amplitude?
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The distance from zero to the maximum value of each alternation
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What is wavelength?
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The distance traveled by the sine wave to complete one cycle
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