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Electronic course > Nature of Electricity > Flashcards

Nature of Electricity Flashcards

0
Q

Electrons are much smaller than atoms

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1
Q

Atoms with free electrons in their outer orbits are poor electrical conductors

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2
Q

Electrons flow form the negative (-) battery terminal to the positive (+) battery terminal

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3
Q

Aluminum is a better conductor than copper

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4
Q

An insulator carries almost no electric current, even when a very high voltage is applied

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5
Q

Electric current is the flow of protons through a conductor

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6
Q

The wires that carry electric current in a circuit are called the conductors

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7
Q

Copper is a better conductor than silver

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8
Q

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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9
Q

An important rule concerning static charges is that like charges ????? each other and unlike charges ????? each other

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10
Q

A lightning strike occurs when (like, unlike) ???? charges develop between a cloud and the earth.

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11
Q

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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12
Q

Static electricity can be generated by friction and by ????

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13
Q

Two methods used to eliminate static charges are ???? ad ????

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14
Q

The movement of electrons is called electric ????

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15
Q

A common source of direct current is a ???

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16
Q

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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17
Q

In an electrical circuit, the conductors can be compared to the ????? in a water system

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18
Q

In a water system, a valve can be compared to the ???? in an electrical system

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19
Q

Another term for electromotive force is ???

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20
Q

What is the symbol of the electrical unit volts?

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21
Q

What is the symbol of the electrical unit ampere?

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22
Q

What is the symbol of the electrical unit ohm?

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23
Q

What is the symbol of the electrical unit coulomb?

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24
Q

What is the symbol of the electrical unit watt?

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25
Q

Convert the number 43,000 to scientific notation

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26
Q

Convert the number 0.0025 to scientific notation

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27
Q

What prefix is used to indicate the number 1,000,000?

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28
Q

What number does the prefix nano stand for?

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29
Q

What prefix is used to indicate the number 0.000001?

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30
Q

????? is the opposition that a circuit or substance creates against the flow of electrical current.

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31
Q

A ???? is wirewound resistor with a sliding tap

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32
Q

Carbon resistors are also called ???? resistors.

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33
Q

There are two basic types of potentiometers, the ???? and the ???

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??? and the ???

34
Q

the fourth band on a carbon resistor tells you the ???? of the resistor (stated as a percentage).

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35
Q

?????, a type of wire with poor conductivity, is often used to make wirewound resistors.

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36
Q

If the fourth color band on a resistor is yellow, the resistor has a tolerance of ???? percent.

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37
Q

Schematic diagrams are simplified drawings of electrical circuits that show all the electrical components.

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38
Q

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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39
Q

A closed circuit is one in which the switch is turned off

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40
Q

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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41
Q

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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42
Q

A relay is a type of electrical switch that works through electromagnetism

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43
Q

In electrical work, silver is used as a (n)

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44
Q

Glass, rubber, porcelain, and paper are examples of electrical

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Insulators

45
Q

This statement is correct?

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46
Q

In electrical work, resistance is often represented by the

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Greek symbol

47
Q

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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48
Q

How is the number 13,000 abbreviated in scientific notation?

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49
Q

A typical, small, dry cel battery has a voltage of

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50
Q

Why would a person who handles electronic components wear a grounded wrist strap?

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51
Q

When two nonconducting materials such as hard rubber and fur are rubbed together, what kind of electricity is generated?

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52
Q

In the electric series, which one of the following materials is the most negatively charged?

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53
Q

Which one of the following metals is the poorest conductor of electricity?

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54
Q

What color band markings would be seen on a 2.2 Kohms resistor?

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55
Q

One millivolt is equal to

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56
Q

Which one of the following statements is correct?

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57
Q

Which of the following statements about relays is correct?

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58
Q

Which of the following is correct definition of the term armature?

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59
Q

How many electrons are there in an atom of carbon?

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60
Q

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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61
Q

In the Ohm’s law formula, the letter E stands for

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62
Q

Which one of the following letters is used as an abbreviation for electric current?

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63
Q

The prefix Kilo stands for which one of the following values?

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64
Q

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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65
Q

What name is used for a high - power variable resistor?

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Electronic course (2 decks)

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