AnswersTX-Physics CRLab: Circuit Design

Lab: Circuit Design — Unit test Answers

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1
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Charges of +3 µC and –5 µC are 2 mm from each other. The –5 µC charge is replaced with a +5 µC charge.

A
same force, but in the opposite direction
B
same force, but in the same direction
C
greater force, but in the opposite direction
D
greater force, but in the same direction
2
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This circuit diagram lacks a basic feature of a circuit.

Question illustration
A
an energy source
B
conducting wires
C
a switch
D
a device that uses energy
3

A 40 W bulb is left on from 9:00 p.m. to 6:30 a.m.

A
0.10 kWh
B
0.38 kWh
C
100 kWh
D
380 kWh
4

What is the current in a circuit with a 9.0 V battery and a resistance of 36.0 Ω?

A
0.25 A
B
4.0 A
C
45 A
D
324 A
5

A point charge is used to determine the electric field around a charged particle. Why is it necessary that the point charge does not affect the position of the charge being tested?

A
The amount of charge will increase if the charged particle moves closer to the point charge, so any change in position changes the field.
B
The amount of charge will decrease if the charged particle moves closer to the point charge, so any change in position changes the field.
C
Electric fields are inversely proportional to the square of the distance, so any change in position changes the field.
D
Electric fields are directly proportional to distance, so any change in position changes the field.
6

What are used to transfer electrical energy from a power plant all the way to a home?

A
generators
B
turbines
C
power transformers
D
power lines
7

How do electric field lines indicate the strength of the field?

A
by how long the lines are
B
by how close the lines are
C
by the direction the lines are pointing
D
by showing the charge that creates the lines
8

The table lists the time it takes for an amount of charge to pass through a point in a wire. Janelle is exploring the relationship between the brightness of a light bulb and the current that powers it. When applying these currents to the same bulb, the bulb is brighter when the current is greater.Which lists the currents in the order of the bulb brightness they cause from most bright to least bright?

Question illustration
A
W, Y, X, Z
B
Y, W, Z, X
C
W, Y, Z, X
D
X, Z, W, Y
9

A gas water heater is 75% efficient. The energy output used to heat the water is 4.6 kWh.

A
3.5 kWh
B
5.4 kWh
C
6.1 kWh
D
16.3 kWh
10

Which principle states that the net electrical force on a specific charge is equal to the sum of the vector components of the charges applying forces on it?

A
angle principle
B
summation principle
C
superposition principle
D
vector principle
11

Lionel makes a graphic organizer to compare the electric field around a positive charge with the electric field around a negative charge.

Question illustration
A
X: Points away from the chargeY: Points in the direction of the force on the positive chargeZ: Points toward the charge
B
X: Points away from the chargeY: Points in the direction of the force on the negative chargeZ: Points toward the charge
C
X: Points toward the chargeY: Points in the direction of the force on the positive chargeZ: Points away from the charge
D
X: Points toward the chargeY: Points in the direction of the force on the negative chargeZ: Points away from the charge
12

Current X is 2.5 A and runs for 39 seconds. Current Y is 3.8 A and runs for 24 seconds.Which current delivered more charge, and how much more charge did it deliver?

A
X delivered 97.5 C more than Y.
B
X delivered 6.3 C more than Y.
C
Y delivered 91.2 C more than X.
D
Y delivered 1.3 C more than X.
13

Question text not available

Answer not available
14

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

A
Voltage is inversely proportional to current, so when the voltage doubles, the current is cut in half.
B
Voltage is directly proportional to current, so when the voltage doubles, the current is cut in half.
C
Voltage is inversely proportional to current, so when the voltage doubles, the current doubles.
D
Voltage is directly proportional to current, so when the voltage doubles, the current doubles.
15

The table lists the values of the constants used to calculate the electrical force and the gravitational force.

Question illustration
A
The electrical force is much smaller than the gravitational force because 8.99 is much greater than 6.67.
B
The electrical force is much larger than the gravitational force because 8.99 is much greater than 6.67.
C
The electrical force is much smaller than the gravitational force because 109 is much greater than 10–11.
D
The electrical force is much larger than the gravitational force because 109 is much greater than 10–11.

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