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9 Cards in this Set
- Front
- Back
- 3rd side (hint)
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What is the principle behind generators?
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Electricity is produced through magnetism through the principle of electromagnetic induction
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Generators convert ________ energy to _________ energy
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Generators convert mechanical energy to electrical energy
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What are the 3 ways to produce EMF in a wire?
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1. move a magnetic field across a stationary wire.
2. move a wire through a stationary magnetic field (principle of generators) 3. Vary the magnetic flux strength across a stationary wire (principle of transformers) |
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What are the 3 main components of a generator?
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1. Armature - loop of wire
2. Magnetic field -field magnet 3. Form of mechanical energy - to move wire through the magnetic field |
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When considering the right hand rule for generators the: 1. thumb pointing up indicates ________ and 2. the 1st finger pointing straight perpendicular to the thumb indicates _________ and 3. the middle finger pointing perpendicular to the 1st indicates __________.
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1. motion
2. field 3. current |
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Name the 4 factors that regulate the strength of the induced magnetic field:
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1. Strength of the magnetic field
2. The speed of the motion between the lines of force and the conductor 3. The angle between the magnetic lines of force and the conductor 4. The number of turns in the conducting coil (wire) |
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What is the difference between a three phase generator and a single phase generator?
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A single phase generator with full rectification puts out 120 cycles/sec or 120Hz which is 2 pulses per hertz. When you overlap 3 phases 120 deg apart then you have 6 pulses per hertz or 360 pulses per second.
Why is 3 phase better but why are they not used much at all now? |
they maintain a higher voltage since the voltage never drops to 0. It never falls below 75-87% of peak voltage. However these 3 phase generators are a maintenance nightmare so they have been "phased" out
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What does a motor do?
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It converts electrical energy to mechanical energy
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What is an induction motor?
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It is a motor that is driven by electromagnetic induction. A rotor that turns inside a series of magnets (stators). sometimes called a "squirrel cage" motor or rotating transformer
where is this used on an x-ray circuit? |
rotates the anode
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