integrated science b - unit 5: electricity lessons 21-24

which option correctly describes how electrical energy is stored in a battery and in a capacitor?

a capacitor can store energy when placed in a circuit as electrical charges build up on its plates. in a battery, a chemical reaction occurs, releasing the energy needed to push electrons.

which option(s) correctly define an electric circuit? select all that apply

a closed path of conductors a set-up where current flows due to a voltage difference

lessons 21

electricity

lesson 24

electromagnetism

which option correctly models the magnetic field around an electromagnet?

https://cdstools.flipswitch.com/asset/media/555186

which choice correctly models the field lines around a bar magnet?

https://cdstools.flipswitch.com/asset/media/555265

which image correctly shows the effect of the magnetic field on the compass?

https://cdstools.flipswitch.com/asset/media/555273

which choice(s) describe the properties of a permanent magnet? select all that apply

made of metals like iron, nickel, and neodymium can lose their magnetic properties if given a forceful shock can lose their magnetic properties if heated to high temperatures

if a 6 Ω resistor is in a circuit connected to a voltage source, and the current through the circuit is 2 amps, what is the amount of voltage across the circuit?

12 v

the secondary coil consists of 100 loops and has an output voltage of 1000 v. if the primary coil had only 50 loops, what was the voltage across the primary coil?

500 v

which option correctly defines a generator?

a device that converts mechanical energy into electrical energy

examine the scenario. two neutral objects, a balloon and a sweater, are rubbed against each other. which choice most accurately describes the behavior of electric charges in the neutral objects?

electrons move from the sweater to the balloon. the sweater becomes positively charged, while the balloon becomes negatively charged.

the flow of free electrons in a conductor due to the potential difference in volts is known as

current

study the image of a circuit. https://cdstools.flipswitch.com/asset/media/555163 which choice most accurately traces the flow of current in the circuit?

current moves away from the negative pole of the battery, through the light bulb, and toward the positive pole of the battery, in a counterclockwise direction.

lesson 22

currents and circuits

which of the options correctly defines an electromagnetic field?

magnetic and electric fields surrounding a moving, charged particle. these fields are perpendicular to each other and exert forces on charged or magnetic objects.

which choice most accurately defines the law of conservation of charge?

the sum of all charge in a closed system does not change.

which of the following will generate a magnetic field using electricity.

wrapping insulated wire around an iron rod and passing a current through the wire

which choice most accurately explains the role of a circuit component in preventing a circuit from getting too hot and catching fire? select all that apply

0.25 of 1 a circuit breaker can be used to prevent a circuit from getting too hot. a switch in the breaker will open if the current gets too high, resulting in an open circuit. then the current will stop moving through the circuit. a thicker wire can be used to prevent the circuit from getting too hot. a thicker wire will decrease the current of the circuit. the current will continue to move, but at a lesser rate.

if a 10 Ω resistor is in a circuit connected to a 20 v battery, how much current is flowing through the circuit?

2 amps

the primary coil consists of 2 loops and there is a voltage of 6 v across the coil. if the secondary coil consists of 10 loops, what is the induced voltage?

30 v

the secondary coil consists of 20 loops and has an output voltage of 80 v. if the primary coil had 100 loops, what was the voltage across the primary coil?

400 v

which of the following correctly describes how direct currents can be produced by an electromagnetic generator?

a rotating coil, located inside a magnetic field is connected to split metal rings called a commutator that reverse the flow of current every half turn.

a conductor is correctly defined as

a substance that allows the flow of electrons because it contains a sufficient number of free electrons

if a permanent bar magnet is broken in half, which choice most accurately describes the properties of these two new halves?

each half has both a north pole and a south pole. magnetic poles cannot be isolated on two separate objects.

which choice most accurately describes how the south poles of two magnets will interact?

they will repel because like poles repel.

which option most accurately identifies a material that allows electrons to move through it freely?

conductor

which of the following components can store electrical energy?

capacitor

examine the scenario. a charged object is surrounded by the electric field it creates. a proton is placed in the electric field, 0.01 m away from the charged object. which choice(s) most accurately describe factors that would affect the strength of the electric field? select all that apply

change the amount of charge on the charged object. change the distance between the charged object and the proton.

study the images of two circuits. which option most accurately describes the two circuits?

circuit a is a parallel circuit because there are multiple pathways for the current. circuit b is a series circuit because there is only one pathway for the current.

study the images of two circuits. https://cdstools.flipswitch.com/asset/media/555152 https://cdstools.flipswitch.com/asset/media/555154 which option most accurately describes the two circuits?

circuits a and b are both series circuits because there is only one pathway for the current to flow.

which choice most accurately describes the method of storing electrical energy in a capacitor?

a capacitor can store energy when placed in a circuit, and electrons flow from one plate of the capacitor and on to the other

which option correctly identifies types of electromagnetic generators? select all that apply

ac generator dc generator

electromagnetic force is correctly defined as

an attractive or repulsive force that is associated with electric and magnetic fields

which option correctly defines faraday's law?

any change in the magnetic field over a conductor will produce an electromotive force and electric current in the conductor.

which option most accurately defines faraday's law?

any change in the magnetic field over a conductor will produce an electromotive force and electric current in the conductor.

study the images modelling the magnetic fields around earth. which image correctly models the magnetic field lines for earth?

b, because the earth's magnetic field is similar to the magnetic field of a vertical bar magnet.

study the scenario. a magnetic field is generated when using an electromagnet. the events that occur to create the magnetic field are listed below. a. the magnetic domains align inside the piece of metal. b. close the circuit so a current flows through it. c. wrap a wire to create loops around a piece of metal, such as iron. d. the magnetic field is generated inside the loops. what is the correct order of events?

c, b, d, a

study the image of a circuit. if all bulbs are identical, which choice most accurately traces the flow of current in the circuit?

current moves counterclockwise from side a of the battery to side b of the battery, through each light bulb.

examine the scenario. a charged particle is placed in object a's electric field. which choice(s) correctly describes a factor that would strengthen the force the particle experiences in the electric field? select all that apply

decrease the distance between the particle and object a. increase the magnitude of the charge of object a.

direct current is correctly described as

electrical current that flows continuously in one direction

which option can be correctly defined as a device that steps up or steps down voltage?

electrical transformer

study the scenario. matilda wrapped a coil of wire around an iron bar. she connected the ends the wire to the poles of a battery. which of the following is matilda trying to accomplish?

generating a magnetic field using electricity

which of the following correctly describes a step-up transformer? select all that apply

has a higher voltage on the secondary than the primary has greater number of windings on the secondary than the primary

study the images of two circuits.​ you are given the following components: two bulbs, wires, a switch, and a battery. select the choice identifying the circuit that will allow at least one bulb to light when the switch is closed, along with the most accurate description of how the current flows.

in circuit b, the current will move counterclockwise through the circuit and electrical energy will be converted to light energy and light bulb 2.

which choice most accurately describes how the structure of insulators makes them bad conductors?

insulators have a large number of tightly- bound electrons that do not allow for the easy movement of electrons through them.

study the image https://cdstools.flipswitch.com/asset/media/555285 which choice correctly identifies the lines surrounding the object in the image?.

magnetic field

lesson 23

magnetism

study the description. material a allows electrons to move through it freely, while material b does not allow electrons to move through it. which choice most accurately describes the two materials?

material a must be a conductor, while material b is an insulator. electrons can move easily through conductors but not through insulators.

study the description. material a allows electrons to move through it freely, while materials b and c do not allow electrons to move through them. which choice most accurately describes the three materials?

material a must be a conductor, while materials b and c are insulators. electrons can move easily through conductors but not through insulators.

which choice most accurately describes how the structure of metals makes them good conductors?

metals have a large number of free outer electrons that allow for the movement of electrons through them.

study the image of two objects and their initial charge. https://cdstools.flipswitch.com/asset/media/553984 when the objects interact, which option indicates a possible net charge for each object?

object a: +1 object b: -3

study the image of two objects with initial charge. https://cdstools.flipswitch.com/asset/media/553994 when the objects interact, which option indicates a possible charge for each object?

object a: 0 object b: 0

the opposition to the flow of electrons in a circuit is known as

resistance

study the image of a bar magnet and its magnetic field. which choice correctly describes the magnetic field lines around the magnet?

side 1 is the north pole of the magnet and side 2 is the south pole. magnetic field lines are directed away from the north pole and toward the south pole.

study the image of two objects with initial charge. https://cdstools.flipswitch.com/asset/media/553985 when the two objects come in contact, which choice most accurately describes the behavior of electric charges?

some electrons move from the negative object to the neutral object. both objects will be negatively charged, but the object that started negatively charged is less negatively charged than it was initially.

which choice correctly defines an object that becomes magnetized when placed in the presence of a magnet's magnetic field, but eventually loses magnetic properties when removed from the field?

temporary magnet

study the image of a circuit. https://cdstools.flipswitch.com/asset/media/555162 if all the light bulbs are identical, which choice most accurately compares the current moving through points a, b, and c?

the amount of current moving through a, b, and c is the same because the current is the same throughout all points in a series circuit.

which choice correctly describes the effect of the magnetic field on a compass?

the compass needle will move so it is aligned with the magnetic field. the north (red) side will point toward the south pole of the object creating the field because opposites attract. the needle is parallel to the field.

examine the scenario. some amount of current, a, is moving through a circuit. if the resistance of the circuit is halved, which option correctly describes the effect on the current?

the current increases to 2 x a because a smaller resistance increases the flow of current. as resistance decreases current increases.

study the image of a circuit. https://cdstools.flipswitch.com/asset/media/555175 if all light bulbs are identical, which choice most accurately compares the current moving through a to the current moving through b?

the current moving through a is less than the current moving through b because there is more resistance from two light bulbs than from one light bulb. a greater amount of current will go through the path of less resistance.

examine the scenario. a circuit is arranged so that 20 A of current is flowing through it. the battery is replaced with another battery with ¼ the original voltage. which choice correctly describes the effect on the current?

the current reduces to ¼ of the original current because a smaller voltage indicates that there is less energy to move the charge. as voltage decreases in a circuit, current also decreases.

examine the scenario. initially, two protons are held some distance, apart. which choice most accurately describes the electric energy between the two protons?

the electric energy is due to the protons' charges and positions within an electric field, so their energy is a form of potential energy.

study the image of an electron in a field. https://cdstools.flipswitch.com/asset/media/554002 which choice most accurately describes the behavior of the electron in the field?

the electric field lines are directed away from a positive charge and toward a negative charge. an electron would move in a direction opposite the electric field.

examine the scenario. a charged particle is surrounded by an electric field. an electron is placed in the electric field. which choice most accurately describes the behavior of the electron in the field?

the electron will move opposite the direction of the electric field.

examine the scenario. a positively charged conductor is brought in contact with a negative conductor. which choice most accurately describes the motion of charge between these two objects?

the electrons in the negative object are attracted to the positively charged object. some of the electrons move from the negative object to the positive object.

examine the scenario. a positively charged conductor is brought in contact with a neutral conductor. which choice most accurately describes the motion of charge between these two objects?

the electrons in the neutral object are attracted to the charged object. some of the electrons move from the neutral object to the charged object, resulting in two positively charged objects.

examine the scenario. two magnets are placed near each other. the north pole of one magnet is facing the south pole of the other magnet. which choice describes the interaction of the magnetic fields as you move the magnets closer together?

the magnetic field lines for each magnet will become more closely spaced and the magnets will exert stronger forces attracting each other.

which choice correctly defines magnetic poles?

the points on the end of magnet, where the magnetic field is strongest

study the image of two magnets. https://cdstools.flipswitch.com/asset/media/555323 which choice correctly identifies the poles of the two magnets in the image?

the poles facing each other are both south poles because the magnetic field lines repel and are directed toward the poles.

examine the scenario. a charged particle is surrounded by an electric field. a proton is placed in the electric field. which choice most accurately describes the behavior of the proton in the field?

the proton will move in the same direction as the electric field.

examine the scenario. objects a and b are magnets. the north pole of object a is placed next to the south pole of object b. which choice most accurately describes the interaction of these two poles?

they will attract because opposite poles attract.

study the images. which option most accurately describes the types of transformers?

transformer a is a step up transformer because the primary has fewer coils than the secondary. transformer b is a step down transformer because the primary has more coils than the secondary.

examine the scenario. a stream of negatively-charged particles is moving to the right in a magnetic field. the particles experience a force downward. which situation(s) would result in the particle stream experiencing an upward force? select all that apply

using positively-charged particles moving to the right using positively-charged particles moving to the left