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36 Cards in this Set
- Front
- Back
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The product of the readings of an AC voltmeter and AC ammeter is called: |
A) Apparent Power |
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What is the basic unit of electrical power? |
B) Watt |
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What is the term used to express the amount of electrical energy stored in an electrostatic field? |
A) Joules |
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What device is used to store electrical energy in an electrostatic field? |
C) Capacitor |
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What formula would determine the inductive reactance of a coil if frequency and coil inductance are known? |
B) X(lower L) = 2(pi)f L |
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What is the term for the out-of-phase power associated with inductors and capacitors? |
D) Reactive power |
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What determines the strength of the magnetic field around a conductor? |
D) The amount of current |
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What will produce a magnetic field? |
C) A current flowing through a conductor |
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When induced currents produce expanding magnetic fields around conductors in a direction that opposes the orginal magnetic field, this is known as: |
A) Lenz's law |
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The opposition to the creation of magnetic lines of force in a magnetic circuit is known as: |
D) Reluctance. |
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What is meant by the term "back EMF"? |
C) A voltage that opposes the applied EMF |
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3-2A6 Permeability is defined as: |
B) The ratio of magnetic flux density in a substance to the magnetizing force that produces it. |
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Learn Units, Kilo, Mega Giga, Tera... mili, micro nano pico. |
.... |
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to the right on chart for zeros from mega to kilo you |
multiply |
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to the left on chart for zeros from kilo to giga you |
divide |
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What is the push or pressure of electricty known as? |
Voltage |
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Comparing electricity to water voltage is similar to? |
PSI |
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What is another name for voltage? |
Electro Motive Force |
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The flow of electricity is known as? |
Current |
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Current is measured in units called? |
Amperes |
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Compaing electricity to water current is similar to the flow of? |
water in Gallons Per Minutes. |
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The opposition to current flow in a DC circuit is known as? |
Resistance and is measured in Ohms. |
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Comparing resistance to water it is similar to a |
a bend in a hose... |
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Power is the total work performed in a component or entire circuit... and measured in units called? |
Watts |
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3-3A1 What metal is usually employed as a sacrificial anode for corrosion control purposes? |
C) Zinc bar. |
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3-3A2 What is the relative dielectric constant for air? |
A) 1 |
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3-3A3 Which metal object may be least affected by galvanic corrosion when submerged in seawater? |
D) Stainless steel propeller shaft |
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3-3A4 Skin effect is the phenomenon where: |
A) RF current flows in a thin layer of the conductor, closer to the surface, as frequency increases. |
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3-3A5 Corrosion resulting from electric current flow between dissimilar metals is called: |
D) Galvanic corrosion |
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3-3A6 Which of these will be most useful for insulation at UHF frequencies? |
B) Mica |
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3-4A1 What formula would calculate the total inductance of inductors in series? |
B) L1 = L1 + L2 |
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3-4A2 Good conductors with minimum resistance have what type of electrons? |
D) Many free electrons |
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3-4A3 Which of the 4 groups of metals listed below are the best low-resistance conductors? |
A) Gold, Silver, and Copper |
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3-4A4 What is the purpose of a bypass capacitor? |
C) It removes alternating current by providing a low impedance path to ground. |
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3-4A5 How would you calculate the total capacitance of three capacitors in parallel? |
B) Ct = C1 + C2 + C3 |
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3-4A6 How might you reduce the inductance of an antenna coil? |
C) Reduce the number of turns. |
