Physics Test #3

Question 1

Charge

Answer 1

a fundamental property of matter…imbalance of protons and electrons

Question 2

SI unit of charge

Answer 2

coulomb

Question 3

Conductors

Answer 3

transmit charges readily

Question 4

Semiconductors

Answer 4

intermediate; their conductivity depends on impurities and can be manipulated by external voltages

Question 5

Insulators

Answer 5

do not transmit charge easily

Question 6

Induction

Answer 6

the process of generating a current in a conductor by placing it in a changing magnetic field

Question 7

Coulomb’s Law

Answer 7

two charged objects feel a force between them

Question 8

Superposition Principle

Answer 8

the net effect of all charges in an arrangement is the same as the sum of the individual effects of each charge taken seperately

Question 9

Electric Field

Answer 9

a region around a charged particle within which a force would be exerted on other charged particles (vector)

Question 10

Uniform Electric Field

Answer 10

have same direction and magnitude

Question 11

Work

Answer 11

the transfer of energy to or from a system

Question 12

Electric Potential

Answer 12

the amount of work needed to move a charge from a reference point to a specific point against an electric field (a scalar)

Question 13

Potential Energy (per unit charge)

Answer 13

a measure of how much each charge effects the total energy

Question 14

Electric Potential Units

Answer 14

J/C (volt)

Question 15

Potential Difference

Answer 15

delta V

Question 16

Equipotential Lines

Answer 16

connect points of the same potential; always perpendicular to electric field lines

Question 17

Capacitance

Answer 17

the ratio of charge to potential difference (farad or 1 C/V)

Question 18

Parallel Plate Capacitor

Answer 18

any two charged objects form a capacitor; between plates electric field is constant

Question 19

Battery

Answer 19

used to move charge (Q) and charge the capacitor

Question 20

Dielectrics

Answer 20

nonconducting material between the plates of a capacitor used to increase capacitance; ratio of the capacitance with and without (k)

Question 21

Electric Current

Answer 21

the net change in charge per unit time (A)

Question 22

Conventional Current

Answer 22

assumes charges are positive

Question 23

Resistance depends on

Answer 23

size and shape of material; and type of material

Question 24

Resistivity (P-rho)

Answer 24

a property of a material type (amount)

Question 25

Resistance (R)

Answer 25

a particular element (size)…flow of charge is effected by the material it travels through

Question 26

Resistance SI Unit

Answer 26

ohm

Question 27

Resistors in Series

Answer 27

add resistors together

Question 28

Resistors in Parallel

Answer 28

add reciprocals

Question 29

Capacitors in Series

Answer 29

add reciprocals

Question 30

Capacitors in Parallel

Answer 30

add capacitors together

Question 31

Power

Answer 31

the rate at which work is done

Question 32

SI units of Power

Answer 32

Watts (J/s)

Question 33

Voltmeter

Answer 33

measures voltage across a component; hooked up in parallel

Question 34

Ammeter

Answer 34

measures current through a component; hooked up in series

Question 35

Junction Rule

Answer 35

total current entering a junction must equal the total current exiting a junction

Question 36

Junction

Answer 36

the point where three or more wires intersect

Question 37

Loop Rule

Answer 37

sum of potential differences around any closed loop is 0

Question 38

Loop

Answer 38

any complete closed path around a circuit

Question 39

Travel direction from - to +

Answer 39

+E

Question 40

Travel direction from + to -

Answer 40

-E

Question 41

Travel direction opposite to current direction

Answer 41

+IR

Question 42

Travel direction in current direction

Answer 42

-IR

Question 43

Nano-coulomb (nC)

Answer 43

10^-9

Question 44

Micro-coulomb (uC)

Answer 44

10^-6

Question 45

Milli-coulomb (mC)

Answer 45

10^-3