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Flashcards in Electricity Basics Deck (33)
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1

Atom

The smallest constituent unit of ordinary matter that has the properties of a chemical element.

2

Molecule

Electrically neutral group of two or more atoms held together by chemical bonds

3

Element

Any material that is composed of only one type of atom

4

Compound

Any material that is composed of more than one type of atom

5

Electron Shell Pattern

2n^2
1st shell - 2 electrons
2nd - up to 8
3rd - up to 18
4th - up to 32
etc.

6

Valence Shell

The outer shell of any atom

7

When the valence electron in any atom gains sufficient energy from some outside force, it can break away from the parent atom and become a ___________.

free electron

8

Atoms with few electrons in their valence shell tend to have....

more free electrons since these valence electrons are more loosely bound to the nucleus.

9

Electrical current

The directional movement of electrons between atoms

10

Electricity

A word to describe the directional flow of electrons between atoms

11

Voltage

The force or pressure of moving electrons in a circuit
Measured in volts (Abbreviated V. or expressed by the symbol E)

12

Amperage

The flow rate of electrons

13

Power

Measured in Watts

14

Volt (E)

The unit of force (electrical pressure) that causes electrons to flow through a wire

15

EMF

Electromotive force. Electrical pressure.

16

Ampere or amp (I)

.Unit of electrical current flowing through a wire. (Abbreviated A or expressed by the symbol I for Intensity of current)

17

Just as pipe is sized by the rate of water passing through it, a wire is sized according to...

the rate of electrons (amps) flowing through it

18

Amp-hour (Ah)

One amp of current flowing for one hour. Commonly used when describing battery capacity.

19

Watt

A unit of electrical power equivalent to a current of one ampere under a pressure of one volt.
Watts indicate the rate at which an appliance uses electrical energy or the RATE at which electrical energy is produced.

20

Watt-hour

Electrical unit of energy. One watt consumed for one hour.

21

Kilowatt-hour (kWh)

1,000 watt-hours

22

What are some common voltages used in light-duty electrical systems?

12v, 24v, 48v

23

Most homes use ___v and ___v systems.

120v and 240v

24

Power = Watts (W) =

Volts (V) x Amps (A)

25

Energy = Watt-hours (Wh) =

Watts x Hours

26

Amp-hours (Ah) =

Amps x Hours

27

Series wiring connections are made at the ______ end of one module to the _______ negative end of another module.

positive
negative

28

When loads or power sources are connected in series, the ______ increases.

voltage
Series wiring does not increase the amperage produced.

29

Two 12VDC, A PV modules wired in series create how many volts and how many amps?

24 Volts
3 Amps

30

Parallel wiring connections are made from the positive to ______ and negative to ______ terminals between modules.

positive to positive
negative to negative