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Flashcards in Electricity 1 Deck (39)
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1

When amber was rubbed with other materials, it became charged with a mysterious force. What was it rubbed with?

Dried leaves and wood shavings.

2

Benjamin Franklin called the attractive and repellant kinds of electricity...

Positive and Negative

3

Electricity is produced by ______ and ________.

Electrons and Protons

4

Matter is...

Anything that has weight and occupies space.

5

______ are the basic materials that make up all matter.

Elements

6

Water is made of

Hydrogen and oxygen.

7

Salt is made of sodium and

Chlorine.

8

The atomic number is the same as an atom’s number of

Protons.

9

A proton is 1/3 the diameter of an electron but contains _______ times more mass.

1840

10

Charged atoms are called

Ions

11

The atoms of all the known elements can have up to _____ shells.

Seven

12

Electricity is produced when____ are freed from their orbits.

electrons

13

Materials that have electrons that are freed easily are called ______?

Conductors

14

Insulators are materials where their electrons are freed _____

difficultly.

15

Electricity as a result of rubbing materials together is called _____.

Triboelectricity

16

Piezoeletricity is the result of _______

Pressure being converted into electricity.

17

Electric current travels at ________.

the speed of light

18

When a good conductor is put directly across the terminals of a power source,

a short circuit is produced.

19

Electric current travels from ___ potential to ___ potential.

Low, high

20

Charge is determined by the number of electrons that the object has ________.

lost or gained

21

Light can also be produced from _______, _______, and ________.

Fluorescence, phosphorescence, and electroluminescence.

22

Any conductor that carries an electric current will act like a ______.

Magnet

23

You can demagnetize an object by _______, _________, and _______.

Striking, heating, and applying a rapidly reversing field.

24

The compass needle points to the _____ magnetic pole.

North

25

Flux lines are compressed in the center of the loop to create a strong field. The north side is the side that the lines of flux ____.

Come out

26

A close-wound solenoid will create a ____ magnetic field.

Stronger

27

A holding relay has an extra set of contacts that _________ after the main switch is closed.

Stays closed

28

A buzzer’s contacts are arranged so that the electromagnetic coil cannot stay ________ continuously.

Energized

29

The _________ switches the wires outside the generator while the rotor turns so that the current will flow in the same direction through the meter at all times.

Commutator

30

An electric circuit consists of ________, _________, and ________.

1. A power source 2. Conductors 3. A load