34670833
Description
Flashcards by That Yeti Dog Person, updated more than 1 year ago
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Created by That Yeti Dog Person
about 3 years ago
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| Question | Answer |
| _______ means the AC current begins as a positive cycle then reverses to a negative cycle 60 per second. | 60 cycles |
| _____ and AC _____ are machines that produce or generate AC voltage. (the larger the machine is the more efficient it is) | alternators, generators |
| AC power can be produced and transmitted at a lower ____ than DC power. It's also more conveniently distributed. | cost |
| Very high voltage is desirable in a transmission line because it makes it possible to reduce ______ in that line. | power loss |
| Power loss due to the heating of conductors can be determined by using this formula _____. | P = I (squd) x R |
| __, __, and __ are the most common VACs in houses etc. | 440, 240, 120 |
| In an _____, a group of conductors revolve in a magnetic field. Because of the constantly changing position of the conductor's relative lines of force, the induced voltage is constantly changing, or "alternating", and the current output is AC current. | alternator |
| The value of AC current at any instant is its _______ value. These values of any AC current change in direction and magnitude at regular intervals. | instantaneous |
| The wavy line, or curve, that connects all points reached by the V or current during a given point in time is the ______. (aka a graph showing the changes in AC voltage or current.) | sine wave |
| AC current starts (as an example) from 0 rises to a max., decreases back to 0, reverses, reaches a max. in the opposite direction, and starts over. This is called one ____. | cycle |
| One ___ equals one complete AC cycle consisting of a positive and negative alternation. | hertz |
| One half of a cycle (the of current or V from one 0 point to the next) is called an ____. | alternation |
| There are ___ alternations in one cycle. | two |
| The highest value a current of V may reach in one cycle is the ____ value, or ____ value, of the cycle. | maximum, peak |
| _____ is the number of cycles completed in one second. | Frequency |
| Frequency is measured in ____. | hertz |
| ___ hertz is the most common frequency used in the US. | 60 |
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