AnswersTX-Physics CRLab: Circuit Design

Lab: Circuit Design — Unit test Answers

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1
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Which equation relates charge, time, and current?

A
I equals delta q over t
Option A
B
I equals t over delta q.
Option B
C
Option
Option C
D
Option
Option D
2
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Jonas sees this symbol in a circuit diagram.

Question illustration
A
resistor
B
bulb
C
battery
D
voltmeter
3

Bruce collects the data on four electric circuits listed in the table. Bruce must report any circuits that deliver more than 4.0 C of charge in 8.0 s.Which lists every circuit that Bruce must include in his report?

Question illustration
A
X and Z
B
X and Y
C
W and Y
D
W and Z
5

What is a path through which electric charges travel?

A
electric circuit
B
resistance
C
voltage
D
electric current
7

Which are disadvantages of series circuits? Check all that apply.

A
They are easy to design and build.
B
They are complicated to design and build.
C
A break in one wire causes all current to stop.
D
Current can flow through other branches if there is a break in one branch.
E
If one bulb goes out, the others stay lit.
F
If one bulb goes out, the others go out.
9

Which changes would cause an increase in the resistance of a wire? Check all that apply.

A
increasing its temperature
B
decreasing its temperature
C
using a longer wire
D
using a shorter wire
E
using a thicker wire
F
using a thinner wire
10

In a movie, the heroine saves the day by cutting a wire before the time runs out on a timer.

A
She changed a short circuit to an open circuit.
B
She changed an open circuit to a closed circuit.
C
She changed a closed circuit to an open circuit.
D
She changed a closed circuit to a short circuit.
12

Jason sees a news report about a traffic jam caused by a truckload of tires that spilled across the road. The next day in class, he uses the traffic jam as an analogy to explain electric circuits to his friend.Which is most likely the analogy that Jason used?

A
The cars represent moving charges, and the spilled tires represent an increased voltage that causes the current to decrease.
B
The cars represent moving charges, and the spilled tires represent an increased resistance that causes the current to decrease.
C
The tires represent moving charges, and the cars represent an increased resistance that causes the current to decrease.
D
The tires represent moving charges, and the cars represent an increased voltage that causes the current to decrease.
13

Cici uses a long extension cord to plug a lamp into a wall outlet in the next room.What effect will the extension cord have on the circuit?

A
It will decrease the resistance of the circuit.
B
It will increase the voltage of the outlet.
C
It will increase the resistance in the circuit.
D
It will decrease the voltage of the outlet.
14

A circuit that has only a single path for current to flow through is best classified into which category?

A
a series circuit
B
an open circuit
C
a parallel circuit
D
a short circuit
15

What is the unit for measuring electric current?

A
volt
B
ampere
C
ohm
D
coulomb
18

A wire delivers 12.0 C of charge in 4.0 s.What is the current in the wire?

A
3.0 A
B
8.0 A
C
16 A
D
48 A
19

Which statement correctly describes the formation of an electric current?

A
A resistance causes electric charges to move from lower to higher potential.
B
A voltage causes electric charges to move from lower to higher potential.
C
A resistance causes electric charges to move from higher to lower potential.
D
A voltage causes electric charges to move from higher to lower potential.
20

What is the continuous flow of electric charge?

A
voltage
B
resistance
C
potential difference
D
current
21

For a constant voltage, how is the resistance related to the current?

A
Resistance is inversely proportional to current, so when the resistance doubles, the current is cut in half.
B
Resistance is directly proportional to current, so when the resistance doubles, the current is cut in half.
C
Resistance is inversely proportional to current, so when the resistance doubles, the current doubles.
D
Resistance is directly proportional to current, so when the resistance doubles, the current doubles.
22

A circuit featuring multiple paths through which current can flow is best classified into which category?

A
a series circuit
B
an open circuit
C
a parallel circuit
D
a short circuit
23

A circuit is built based on the circuit diagram shown.

Question illustration
A
1.2 A
B
1.5 A
C
2.0 A
D
4.6 A
24

Which quantities are equal to sum of the individual values within a circuit?

A
the current in a parallel circuit and the voltage in a series circuit
B
the resistance in a parallel circuit and the current in a series circuit
C
the resistance in a parallel circuit and the voltage in a series circuit
D
the voltage in a parallel circuit and the resistance in a series circuit
25

Suchita sees this symbol shown in a circuit diagram.

Question illustration
A
to measure current
B
to measure voltage
C
to provide electrical energy
D
to use electrical energy

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