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58 Cards in this Set
- Front
- Back
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When a circuit breaker trips, in what position will you find the oerpating handle? |
half way between on and off |
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most 12 v car battery are made up of eight individual cells connected in series. what is the voltage of each cell in a car battery? |
1.5V |
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a light bulb is 60 watts. operated at 120 volt, how much current does it draw? |
0.5 ampere |
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how many wires do serial cables used on computers have? |
9 |
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a rheostat is |
an electrical instrument used to control a current by carrying the resistance |
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an aa battery produces a potential difference of 1.5v. Four AA batteries are placed in series to pwoer a portable FM radio. What is the total voltage of the radio? |
6.0 V |
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An electromagnetic-induction device usually has which of the following materials in its core? |
iron |
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electricians use the term low potential to refer to: |
600 watts or less |
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When working with electricity, you should assume that all electrical equipment is alive unless you know for certain otherwise. This prevents; |
personal injury |
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the television boradcast standard used in the US is |
NTSC |
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When a circuit breaker trips, in what position will you find the oeprating handle? |
half way between on and off |
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printd circuit boards are typically made out of |
fiberglass |
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silver is a better conductor than copper. But copper is mroe often used because of |
the cost of silver |
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Millihenries are related to |
inductors |
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electronic circuits that prodcue high frequency AC are called: |
oscillators |
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to cause a current of 10 amperes to flow through 20- ohm resistance, the voltage needed is: |
200 volts |
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insulated fittings can be used to splice wires, thus, eliminating the need for: |
soldering the wires together |
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how many paths of electrical flow can be found in a series circuit? |
one |
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Transistors contain at least three terminals called the: |
base, emitter, and colelctor |
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ohm's law states: |
voltage = current * resistance |
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which electronic component can strore charge |
a capacitor |
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definition of capacitor |
a device used to store an electric charge, consisting of one or more pairs of conductors separated by an insulator |
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the ground wire is always |
green |
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in a closed elec trical circuit |
positive and negative |
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changing alternating current to direct current is called: |
rectification |
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electromotive force is another way of saying |
voltage |
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definition of voltage |
an electromotive force or potential difference expressed in volts |
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most wirse are made from |
copper
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another name for cycles per second is |
hertz |
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what special type of diode is commonly used to regulate voltage? |
zenner diode |
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zener diode |
a form of semiconductor diode i which at a critical reverse voltage a large reverse current can flow |
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newer cell phones contain a removable memory card, which is often called a |
sim card |
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a number 12 wire, compared to a number 6 wire |
is smaller in diameter |
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how many wires do serial cables used on computers have? |
9 |
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a properly soldered connection will appear |
shinny |
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which of the following isn't a component of a DC motor? |
rotor bars |
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definition of rotor |
a rotary part of a machine or vehicle, in particular
- a hub with a number of radiating airfoils that is rotated in an approximately horizontal plane to provide the lfit for a rotary-wing aritcraft - the rotating assembly in a turbine, especially a wind turbine |
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radar can operate at frequencies as high as |
100,000 MHz |
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Ohm's law states: |
voltage= current * resistancve |
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to produce greater storgge of electrons and mroe capacitance, capacitors should: |
be connected in parallel |
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rheostat definition |
a rheostat is an electrical instrument used to control a current by varying the resistance |
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what's the primary advantage of a quad-band cell phone over a dual band cell phone? |
coverage area |
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IN a closed electrical circuit |
One terminal is always positive, and one terminal is always negative |
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What does RMS stand for? |
root mean square |
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the definition of root mean square |
the square root of ther arithmetic mean of the squares of a set of values, used as a measure of the typical magnitude of a set of number, regardless of their sign |
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the hot wirse is always |
black
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If a 120 volt current is protected by a 25 amp circuit breaker, what's the alrgest number of watts an appliance can safely use? |
3,000 watts |
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transistors contain at least three terminals called the: |
base, emitter, and collector |
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another name for cycles per second is: |
hertz |
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which of the following isn't a conductory of electricty? |
glass |
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a transistor is also called a |
a crystal amplifier |
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an oscilloscope is typically used to analyze |
complex wave forms |
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oscilloscope |
a device for viewing scillations, as of electrical voltage or current, by a display on the screen of a cathode ray tube |
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How wide is the full AT motherboard? |
12 inches |
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an electromagnetic-induction device usually has which of the following materials in its core? |
iron |
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to control a light fixture from two different wall sweitches, you should use |
two three-way switches |
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how many paths of electrical flow can be found in a series circuit? |
one |
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If you plug an appliance desgined for AC into a DC power source, the appliance: |
will produce excessive heat |
