section 5

Question 1

Power is directly related to what 2 factors?

Answer 1

Current and Voltage

Question 2

What is the difference between a Poteniometer and and Rheostat?

Answer 2

Pot controls voltage and has three terminals

Rheo controls current and has two terminals

Question 3

What kind of energy is stored in a battery?

Answer 3

Chemical Energy

Question 4

How many many electrons can be in a valence shell?

Answer 4

no more than 8

or 1 thru 8

Question 5

What is a valence shell?

Answer 5

Electrons in the outermost-filled shell

Question 6

How many electrons are in the valence shell of a conductor?

Answer 6

3 or less

Question 7

How many electrons are in the valence shell of an insulator?

Answer 7

5,6,7,8

Question 8

What do you call an atom with 4 electrons in its valence shell?

Answer 8

semi conductor

Question 9

How many electrons are in the valence shell of a semi conductor?

Answer 9

4

Question 10

What do you call an atom with 3 or less electrons in its valence shell?

Answer 10

conductor

Question 11

What do you call an atom with 5,6,7, or 8 electrons in its valence shell?

Answer 11

insulator

Question 12

What is an ion?

Answer 12

Charged particles (can move in solutions)

Question 13

What is Colomb’s law?

Answer 13

If charges are the same, the force is repulsive.
if charges are different, the forces are attractive
(ie. think of a magnet)

Question 14

What are the three forms of energy?

Answer 14

Potential
Rest
Kinetic

Question 15

If you the double voltage across a load, what happens to the current?

Answer 15

increases/ doubles

Question 16

If a motor has a resistance of 10 ohms and 120V to power, what is the current?

Answer 16

12A

Question 17

What is the voltage across a 940k ohm resistor if the current is 70mA?

Answer 17

65.8kV

Question 18

If a battery is rated at 120AH and is drawing 2A, how long will it last?
if drawing 250mA?

Answer 18

60 hrs

480 hrs

Question 19

Resistors that are colored red,black,green, and gold have how much resistance?
blue,green,gold,gold

Answer 19

2M ohms 5% tolerance

6.5 ohms 5% tolerance

Question 20

If 15 coulombs pass a given point in 2 sec, how much current is there?
in 0.5 seconds?

Answer 20

7.5A
30A
I=Q/t

Question 21

How do we deterermine the atomic number of an atom?

Answer 21

Find out how many protons are in the nucleus

Question 22

What impact does temperature have on a conductor?

Answer 22

warmer temp it moves faster

colder temp it moves slower

Question 23

If you increase the CM (circular mil) of a conductor, what happens to the resistance?
-to the AWG?

Answer 23

decreases

decreases

Question 24

Define Horsepower

Answer 24

commonly used unit for measuring the power of motors

-one hp is equal to 746W

Question 25

When current flows thru a conductor, what is created around the conductor?

Answer 25

magnetic lines of flow or magnetic field

Question 26

Current flows from ______ to _______?

Answer 26

negative to positive

Question 27

Describe Load.

Answer 27

a component that uses the power provided by the rest of the current

Question 28

Power is measured in _______?

Answer 28

Watts

Question 29

Voltage is measured in ______?

Answer 29

Volts

Question 30

Current is measured in ______?

Answer 30

Amps

Question 31

Resistance is measured in ______?

Answer 31

Ohms

Question 32

Conductivity is measured in ______?

Answer 32

Mhos

Question 33

What do we call the opposition of current flow?

Answer 33

Resistance

Question 34

If resistance increases, what happens to current?

Answer 34

decreases

V/R=I

Question 35

If voltage increases, what happens to current?

Answer 35

increases

V/R=I

Question 36

Color codes for resistors.

Answer 36

pg 76 table 3-2