# Electric currents and circuits

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Electric currents and circuits

Slide2Is it possible to light a bulb with a battery using only one wire?

YesNoI have no idea

NEXUS/Physics Clicker Questions

Slide3Which of the arrangements shown will light the bulb?

Only AOnly BOnly COnly DOnly EOnly FA & CB & FD & E

NEXUS/Physics Clicker Questions

Slide4In the two cases shown here a battery is connected to a box containing some identical bulbs. The battery maintains a constant potential difference V0. across its terminals. Which bulbs will be brighter?

A in #1B in #1A and B in #1 (equal)A in #2B in #2A and B in #2 (equal)All 4 equalOther

NEXUS/Physics Clicker Questions

Slide5Charge flows through a light bulb. Suppose a wire is connected across the bulb as shown. When the wire is connected,

all the charge continues to flow through the bulb.half the charge flows through the wire, the other half continues through the bulb.all the charge flows through the wire.none of the above

Slide6This circuit has two identical light bulbs burning with equal brightness and a single 12 V battery. When the switch is closed, the brightness of bulb A

increasesdecreasesdecreases to 0remains the same

NEXUS/Physics Clicker Questions

Slide7This circuit has two identical light bulbs burning with equal brightness and a single 12 V battery. When the switch is closed, the brightness of bulb B

increasesdecreasesdecreases to 0remains the same

NEXUS/Physics Clicker Questions

Slide8Which of the bulbs in the following circuit is (are) the brightest?

ABCDB and CA and DSomething elseYou can’t tell from the information given

NEXUS/Physics Clicker Questions

Slide9Sample Problem

How do the currents in resistors A and B compare?How do the voltage drops across resistors A and B compare?How does the current in and voltage drop across resistor C compare to those in A and B?Find the current in resistor D.

(

R)

(R)

(2R)

(3R)

(V0)

I0 = V0 /R

NEXUS/Physics Clicker Questions

Slide10Sample Problem

If bulb D is removed from its socket, how does the brightness of the three bulbs A, B, and C change?

(

R)

(R)

(2R)

(3R)

(V0)

I0 = V0 /R

NEXUS/Physics Clicker Questions

Slide11Sample Problem

If bulb D is put back in its socket, and now bulb C is removed, rank the brightness of the three bulbs A, B, and D?

(

R)

(R)

(2R)

(3R)

(V0)

I0 = V0 /R

NEXUS/Physics Clicker Questions

Slide12Use Kirchhoff's principles to find: the current through each of the bulbs and the current through each of the batteries.

#1 = 6V

#2 = 3VA = B = C = 3Ω

NEXUS/Physics Clicker Questions

Slide13What can you say about the voltage at the points A, B, and C?

The magnitudes of the voltages at A and B add up to the magnitude of the voltage at C.The sum of the magnitudes of the voltages at two of the points adds up to the magnitude of the voltage at the third (but we can’t say which).The magnitude of the voltages at all three points are equal.There is not enough information to draw any of the above conclusions.Something else.

Slide14What can you say about the currents at the points A, B, and C?

The magnitudes of the currents flowing through A and B add up to the magnitude of the current flowing through C.The sum of the magnitudes of the currents at B and C add up to the magnitude of the current through A.The sum of the magnitudes of the currents at A and C add up to the magnitude of the current through B.The magnitude of the currents flowing through all three points are equal.There is not enough information to draw any of the above conclusions.Something else

Slide15In what direction is the current at point C flowing?

To the left.To the right.It is zero.There is not enough information to draw any of the above conclusions.Something else.

Slide16What can you say about the voltage at the point C given that we take the voltage at the bottom of the battery to be 0?(V0 = 9 V; R = 3 Ω )

It is zero.It 9 Volts.It is 3 Volts.It is 4.5 Volts.There is not enough information to draw any of the above conclusions.Something else.

## Electric currents and circuits

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