Answers TX-Physics CRLab: Circuit Design

Lab: Circuit Design — Unit test Answers

25 verified answers3 views

Free Preview

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

3.5 kWh

5.4 kWh

6.1 kWh

16.3 kWh

Free Preview

Which device converts kinetic energy into electrical energy?

an electric generator

an electric motor

a step-down transformer

a step-up transformer

Which type of circuit is a continuous loop that allows the flow of current along its intended path?

open

inverted

closed

short

A series circuit contains three 2 Ω resistors and a 6 Ω resistor. The current in each resistor is 4.0 A.

2.0 V

3.0 V

32 V

48 V

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

0.10 kWh

0.38 kWh

100 kWh

380 kWh

This circuit diagram lacks a basic feature of a circuit.

an energy source

conducting wires

a switch

a device that uses energy

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?

angle principle

summation principle

superposition principle

vector principle

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

X: Points away from the chargeY: Points in the direction of the force on the positive chargeZ: Points toward the charge

X: Points away from the chargeY: Points in the direction of the force on the negative chargeZ: Points toward the charge

X: Points toward the chargeY: Points in the direction of the force on the positive chargeZ: Points away from the charge

X: Points toward the chargeY: Points in the direction of the force on the negative chargeZ: Points away from the charge

Trina makes a diagram to summarize how to use the right-hand rule to determine the direction of the magnetic force on each type of charge.

X: Thumb, for velocityY: Fingers, for magnetic fieldZ: Palm of hand, for force

X: Back of hand, for forceY: Thumb, for velocityZ: Palm of hand, for force

X: Palm of hand, for forceY: Thumb, for velocityZ: Fingers, for magnetic field

X: Palm of hand, for forceY: Fingers, for magnetic fieldZ: Back of hand, for force

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?

X delivered 97.5 C more than Y.

X delivered 6.3 C more than Y.

Y delivered 91.2 C more than X.

Y delivered 1.3 C more than X.

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

by how long the lines are

by how close the lines are

by the direction the lines are pointing

by showing the charge that creates the lines

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

Voltage is inversely proportional to current, so when the voltage doubles, the current is cut in half.

Voltage is directly proportional to current, so when the voltage doubles, the current is cut in half.

Voltage is inversely proportional to current, so when the voltage doubles, the current doubles.

Voltage is directly proportional to current, so when the voltage doubles, the current doubles.

Trent builds a model electric motor. When he connects a battery to the motor, the motor spins through a half rotation and stops.

replacing the battery, because it is not providing current

installing new brushes, because they are not making a good connection

checking the commutator, because the current is not reversing

adding more wire coils in the armature, because the electromagnet is too weak

Lidia makes a graphic organizer to compare temporary magnets with permanent magnets.

X: Maintains magnetic properties in the presence of another magnetY: Is made from magnetically hard ferromagnetic material

X: Repels or attracts other magnetsY: Attracts iron objects

X: Maintains magnetic properties in the presence of another magnetY: Is made from magnetically soft ferromagnetic material

X: Attracts or repels iron objectsY: Attracts other magnets

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?

W, Y, X, Z

Y, W, Z, X

W, Y, Z, X

X, Z, W, Y

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

same force, but in the opposite direction

same force, but in the same direction

greater force, but in the opposite direction

greater force, but in the same direction

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

0.25 A

4.0 A

45 A

324 A

Jasmine makes a note card about series circuits. She records the points shown.Which change will correct the error on her note card?

switching the headings on the columns

adding the title Parallel Circuits

moving point (2) into the Advantages column

moving point (4) into the Advantages column

While researching magnetic fields, Marisa finds several online sites that describe a fictitious north monopole that is a magnet with only a north pole. Although it does not exist, the north monopole is used to describe magnetic field lines.

The field lines around a magnet point from the south pole to the north pole to show the direction opposite to the magnetic force on the monopole.

The field lines around a magnet point from the south pole to the north pole to show the direction of the magnetic force on the monopole.

The field lines around a magnet point from the north pole to the south pole to show the direction opposite to the magnetic force on the monopole.

The field lines around a magnet point from the north pole to the south pole to show the direction of the magnetic force on the monopole.

How should he position the pipe cleaners? Check all that apply.

They should exit the box at N and enter at S.

They should exit the box at S and enter at N.

They should be put inside the box so the two ends join.

None should be put inside the box.

They should form loops outside of the box over the top, bottom, and sides of the box.

They should form loops outside of the box, but over only the sides of the box.

Did you find these answers helpful?

Lab: Circuit Design — Unit test Answers

More from this Course

TRY EDGENUITY HACKS