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14 Cards in this Set
- Front
- Back
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What are the basic functions of resistors, inductors, and capacitors? |
Resistor - provide a specified resistance to electrical flow in ohms. Inductor - create a desired magnetic field in henries. Capacitor - create a desired electric field (storage of charge) in farads. |
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What is Conventional Current? |
Positive charges moving from positive terminal through circuit to negative terminal. |
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What is Electron Current? |
Current as electron drift from negative terminal to positive terminal due to the electric field. |
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What else do you need to know about Electron Current? |
- Travels at near the speed of light through the conductor. - Free electrons are accelerated in the direction of the electric field. - Increased velocity is superimposed on random motion of electrons to create electron drift. - Increased velocity due to the electric field is called drift velocity. |
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Current occurs when a voltage exists depending on: |
- The number of free electrons per unit volume of the conducting material. - The charge on each electron - The drift velocity, which depends on the electronic structure of the material as well as temperature - The cross-sectional area of the conducting material |
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What are DC and AC power sources? |
DC - generates direct current AC - generates alternating current |
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What does the resistance of a DC circuit conductor depend on? |
- Material - Length (greater length, greater resistance) - Diameter (thicker wire, less resistance) - Temperature (resistance generally increased with temperature) |
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What are 3 substances that are strongly attracted to the naturally magnetic substance magnetite? |
Iron, Steel, Cobalt. All have ferromagnetic properties. |
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How can magnetic fields be created? |
By the presence of a permanent magnet or by moving electrically charged particles through a wire. |
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What is the electromagnetic wave model? |
- Produced when an electric charge is accelerate by an external force - Accelerating charge disturbs the electrical properties of the space surrounding it which produces a wave consisting of an electric field and magnetic field - When the wave interacts with matter, it gives up its energy and may be perceived as light. |
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What is blackbody radiation? |
- An idealized material that is a perfect emitter and absorber of electro-magnetic radiation - The frequency content is based on the temperature of the emitter - Radiation intensity is greater at higher temperatures - Covers a rang of frequencies and the peak radiation emitted shifts toward higher frequencies as temperature increases |
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Draw an RLC current |
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What does it mean to be luminous? |
When matter produces light |
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What does it mean to be incandescent? |
When visible light is given off due to the high temperature of matter |
