Exam 3 Phy 131

Front 1

For a circuit containing a power supply, current will only flow if the circuit is _____.

Back 1

closed

Front 2

To measure the current thru a circuit element, an ammeter must be hooked in _____ with the circuit element.

Back 2

series

Front 3

To measure the voltage thru a circuit element, a voltmeter must be hooked in _____ with the circuit element.

Back 3

parallel

Front 4

The current into a circuit element is _____ the current out of the circuit element.

Back 4

equal to

Front 5

If one bulb is brighter than an identical bulb, then the current thru the brighter bulb is _____.

Back 5

larger

Front 6

Increasing the voltage across a bulb causes a ______ current thru the bulb.

Back 6

larger

Front 7

The sum of the voltage rises and drops around any closed path is _____.

Back 7

zero

Front 8

The current that enters a node _____ the current that leaves that node.

Back 8

equals

Front 9

As the total resistance of a circuit increases, the current thru the power supply or battery ______.

Back 9

decreases

Front 10

When bulbs are added in series to a circuit, the total resistance _____.

Back 10

increases

Front 11

When bulbs are added in parallel to a circuit, the total resistance _____.

Back 11

decreases

Front 12

The _____ thru bulbs in a series are equal.

Back 12

current

Front 13

The currents thru two circuit elements that are connected in series are _____. Driving this current thru the circuit element with the bigger resistance requires a ____ voltage.

Back 13

same, bigger

Front 14

The _____ across bulbs in parallel are equal.

Back 14

voltage

Front 15

The voltages across two circuit elements that are connected on parallel are _____. For the parallel branch with the bigger resistance, this voltage causes a current which is _____.

Back 15

equal, smaller

Front 16

A battery is a source of constant _____. It is not a source of constant _____.

Back 16

voltage, current

Front 17

The branches of a parallel network are

independent if they are also in parallel with _____.

Back 17

the battery/power source

Front 18

Kirchoff's Loop Law

Back 18

The sum of the voltage rises and drops around any closed path is zero.

Front 19

Kirchoff's Node Law

Back 19

The current that enters a node equals the current that leaves that node.

Front 20

Current (definition)

Back 20

The rate of flow of charge thru a cross section of a wire.

Front 21

Current (equation)

Back 21

I=dQ/dt

Front 22

Current (SI unit)

Back 22

Ampere (A)

Front 23

Electric Potential (equation)

Back 23

V=KQ/R

Front 24

Electric Potential (definition)

Back 24

The amount of electric potential energy for each coulomb of test charge.

Front 25

Back 25

Ground

Front 26

A voltmeter measures __________________ across two probes.

Back 26

the potential difference

Front 27

Potential Difference (equation)

Back 27

ΔV= V(final)-V(initial) or V(+ probe)-V(- probe)

Front 28

Electric Field Lines for Positive Charges

Back 28

Perpendicular to equipotential lines, going from large to small electric potentials.

Front 29

Electric Field Lines for Negative Charges

Back 29

Perpendicular to equipotential lines, going from small to large electric potentials.

Front 30

Back 30

Battery

Front 31

Back 31

Voltmeter

Front 32

Back 32

Ammeter

Front 33

Back 33

Current

Front 34

Back 34

Lightbulb

Front 35

Back 35

Resistor

Front 36

Back 36

Open Switch

Front 37

The electric potential of the earth is chosen to be _________.

Back 37

zero

Front 38

Potential Energy of 2 Point Charges

Back 38

U(Q1+Q2)=KQ1Q2/R

Front 39

Electric Potential Energy

Back 39

KQ(source)Q(test)/R

Front 40

Potential Energy (equation)

Back 40

U=qV

Front 41

Relationship Between Electric Field and Electric Potential

Back 41

The electric field is equal to the negative gradient of the electric potential