Chapter 1

Question 1

_______ is the total opposition that a circuit presents to alternating current similar to resistance in a dc circuit

Answer 1

impedance

Question 2

electrons

Answer 2

particles of an atom that carry a negative charge

Question 3

______ is the flow of charge along a conducting path and is measured in amperes.

Answer 3

current

Question 4

Do these qualities least or greatest resistance?

• high resistivity low conductivity media
• long current path
• small cross sectional area of current path

Answer 4

greatest

Question 5

What are the common DC voltmeter ranges?

Answer 5

200 mv       current shunt readings
2 volts        structure to electrolyte
20 volts       structure to electrolyte and rectifier
200 volts      rectifier voltage output
1000 volts     unknown voltage

Question 6

What is ohm’s law?

Answer 6

V=IxR
V/I=R
V/R=I

Question 7

_______ is the electromotive force or difference in potential expressed in _______

Answer 7

Voltage or potential, volts

Question 8

Typical uses for ammeter?

Answer 8

• rectifier output current
• test current
• bond current

Question 9

AC can be converted to DC by using a

Answer 9

rectifier

Question 10

______ circuit

• V drop across each branch is the same
• current divides into a number of separate branches
• total current entering equals total current leaving

Answer 10

parallel circuit

Question 11

electronic circuitry with analog display

Answer 11

hybrid meter

Question 12

Kirchoffs law current

Answer 12

current entering a junction equals current leaving a junction

Question 13

How to determine current flow?

Answer 13

If current enters on the positive terminal a positive sign will be displayed. if current enters on the negative terminal a negative sign will be displayed

Question 14

ohm meter is used for

Answer 14

used for continuity testing

Question 15

Conductivity is

Answer 15

the inverse of resistivity and is the measure of the ability of a material to pass current

Question 16

______ blank current changes polarity and direction with time.

Answer 16

alternating current.

AC changes polarity and direction 100 or 120 times per second

Question 17

_____ currenct has constant polarity and direction

Answer 17

direct

Question 18

________ is the force that puts charges in motion

Answer 18

voltage

Question 19

The rate to which energy is used by an electrical device is called

Answer 19

Power

Question 20

State kirchoffs law of voltage

Answer 20

sum of voltage drops must equal total voltage

Question 21

__________ is is a DC moving coil-type movement in which an electromagnetic core is suspended between the poles of a permanent magnet.

Answer 21

Darsonval movement

Question 22

Multimeter: Volt meter

What are the units?

HOw is it used to take a reading?

What is between leads?

Answer 22

Volts, connected across the circuit element,

high resistance

Question 23

______ are used to increase or decrease AC voltage or to isolate incoming AC source form outgoing

Answer 23

transformer

Question 24

_________ is the property of a conductor relating its resistance to geometry

Answer 24

resistivity

Question 25

A length of pipe or cables and resistance between a single galvanic anode and structure are examples of _____ circuit.

Answer 25

series

Question 26

Do these qualities least or greatest resistance?

• low resistivity high conductivity media
• short length of current path
• large cross sectional area of current

Answer 26

least

Question 27

how is an ammeter used to take a reading

Answer 27

connected in series in the circuit