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20 Cards in this Set
- Front
- Back
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Electromagnetic force |
Electric potential measured in volts |
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Electromotive Force |
Any device that converts some form of energy directly into electric energy |
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Magnetic field |
Induced by any charge in motion |
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Hans Oersted |
Conducted an experiment that concluded that charges at rest produce no magnetic field |
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Right hand rule |
The direction of the magnetic field lines can be determined by using this rule |
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Helix |
A coil of wire |
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Solenoid |
A coil of wire carrying a current |
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Electromagnet |
A coil of wire carrying a current wrapped around an iron core |
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Electromagnetic induction |
An electric current induced in a circuit if some part of that circuit is in a changing magnetic |
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The magnitude of the induced current depends on these 4 factors |
1) strength of the magnet 2) velocity of the magnetic field as it moves past the conductor 3) angle of the conductor to the magnetic field 4) number of turns in the conductor |
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Michael Fargday |
Discovered that an electric current cannot be induced in a circuit by the mere presence of a magnetic field |
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Transformers work on: |
mutual |
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Electric generator |
Turns mechanical energy into electrical energy |
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Electric motor |
Changes electrical energy into mechanical energy |
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Fact 1 |
An electric motor is similar to a generator only it has a CURRENT passing through the loop producing a magnetic field |
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Which motor do x-ray tubes use? |
Induction motor |
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Transformers |
Do not convert but transforms electric potential and current into a higher and lower intensity |
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Auto Transformer |
Has one winding and varies voltage and current by self induction |
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Shell-type transformers |
This type of Transformer is more efficient than the closed core because it is essentially to closed cores |
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Comnutator Ring |
Switches the direction of the current and reverses the coils alignment and an electric motor |
