Nature of Electricity Flashcards
Electrons are much smaller than atoms
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Atoms with free electrons in their outer orbits are poor electrical conductors
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Electrons flow form the negative (-) battery terminal to the positive (+) battery terminal
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Aluminum is a better conductor than copper
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An insulator carries almost no electric current, even when a very high voltage is applied
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Electric current is the flow of protons through a conductor
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The wires that carry electric current in a circuit are called the conductors
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Copper is a better conductor than silver
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When two nonconducting substances (such as glass and fur) are rubbed together, the substance that picks up electrons from the other substance acquires a (positive, negative) ???? charge
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An important rule concerning static charges is that like charges ????? each other and unlike charges ????? each other
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A lightning strike occurs when (like, unlike) ???? charges develop between a cloud and the earth.
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According to the electric series, if you use a dry flannel cloth to polish a wooden table, the table will have a (positive, negative) ????? charge when you finish
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Static electricity can be generated by friction and by ????
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Two methods used to eliminate static charges are ???? ad ????
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The movement of electrons is called electric ????
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A common source of direct current is a ???
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If a light bulb is properly connected by wires to the terminals of a battery, electrons will leave the ???? terminal of the battery and flow through the wires toward the bulb
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In an electrical circuit, the conductors can be compared to the ????? in a water system
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In a water system, a valve can be compared to the ???? in an electrical system
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Another term for electromotive force is ???
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What is the symbol of the electrical unit volts?
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What is the symbol of the electrical unit ampere?
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What is the symbol of the electrical unit ohm?
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What is the symbol of the electrical unit coulomb?
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What is the symbol of the electrical unit watt?
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Convert the number 43,000 to scientific notation
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Convert the number 0.0025 to scientific notation
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What prefix is used to indicate the number 1,000,000?
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What number does the prefix nano stand for?
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What prefix is used to indicate the number 0.000001?
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????? is the opposition that a circuit or substance creates against the flow of electrical current.
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A ???? is wirewound resistor with a sliding tap
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Carbon resistors are also called ???? resistors.
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There are two basic types of potentiometers, the ???? and the ???
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the fourth band on a carbon resistor tells you the ???? of the resistor (stated as a percentage).
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?????, a type of wire with poor conductivity, is often used to make wirewound resistors.
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If the fourth color band on a resistor is yellow, the resistor has a tolerance of ???? percent.
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Schematic diagrams are simplified drawings of electrical circuits that show all the electrical components.
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An open circuit can occur accidentally as a result of a faulty electrical contact, a broken conductor, or a failed component (such as a burned-out light bulb).
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A closed circuit is one in which the switch is turned off
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A normally closed relay completes the circuit when current is applied to it, and when current is removed, it opens the circuit
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When current is applied to a normally open relay, it breaks the circuit, and when current is removed from it, it opens the circuit.
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A relay is a type of electrical switch that works through electromagnetism
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In electrical work, silver is used as a (n)
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Glass, rubber, porcelain, and paper are examples of electrical
Insulators
This statement is correct?
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In electrical work, resistance is often represented by the
Greek symbol
A resistor is marked with the following color bands: brown, black, red, and silver. What is the resistance of this resistor?
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How is the number 13,000 abbreviated in scientific notation?
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A typical, small, dry cel battery has a voltage of
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Why would a person who handles electronic components wear a grounded wrist strap?
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When two nonconducting materials such as hard rubber and fur are rubbed together, what kind of electricity is generated?
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In the electric series, which one of the following materials is the most negatively charged?
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Which one of the following metals is the poorest conductor of electricity?
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What color band markings would be seen on a 2.2 Kohms resistor?
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One millivolt is equal to
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Which one of the following statements is correct?
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Which of the following statements about relays is correct?
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Which of the following is correct definition of the term armature?
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How many electrons are there in an atom of carbon?
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The air space or material between two charged bodies that prevents the discharge of electricity from one body to the other is the
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In the Ohm’s law formula, the letter E stands for
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Which one of the following letters is used as an abbreviation for electric current?
A
The prefix Kilo stands for which one of the following values?
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The unit of current in which, 6,240,000,000,000,000,000 electrons flow past a given point in a circuit in one second is the
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What name is used for a high - power variable resistor?
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