Listen

Question

What causes clothes to stick together when you pull them out of the dryer?

Question 1 options:

clothing is an inductor

static electricity

they are not charged

clothing is a conductor

Question 2 (3 points)

Listen
Which of the following transformations is correct in a generator?

Question 2 options:

mechanical to electrical

chemical to electrical

electrical to chemical

electrical to mechanical

Question 3 (3 points)

Listen
Which of the answers correctly states the law of electric charges states?

Question 3 options:

Charged objects that move produce electric current.

The energy of charges and mass are interchangeable.

Like charges repel and opposite charges attract.

Every action has an equal and opposite reaction.

Question 4 (3 points)

Listen
What is the buildup of charges on an object called?

Question 4 options:

an electric field

an electric force

an electric charge

static electricity

Question 5 (3 points)

Listen
C:\Users\e199400456\Desktop\GOC\S2PhysicalSci\Q4\Electricity\testimages\circuit1.png
If one of the bulbs in the circuit pictured above went out, the other one would stay on.

Question 5 options:

False

True

Question 6 (3 points)

Listen
Charging by ____ occurs when electrons are transferred from one object to another by direct contact.

Question 6 options:

reduction

radiation

conduction

induction

Question 7 (3 points)

Listen
Which of the following actions will cause a magnet to become demagnetized?

Question 7 options:

heating it up

sticking it to a refrigerator

sawing it in half

cooling it down

Question 8 (3 points)

Listen
What do you call a magnet with an iron core that is produced by an electric current?

Question 8 options:

temporary magnet

electromagnet

ferromagnet

permanent magnet

Question 9 (3 points)

Listen
Where are the magnetic effects of a bar magnets the strongest?

Question 9 options:

ends

bottom

top

center

Question 10 (3 points)

Listen
What do all circuits need to function?

Question 10 options:

an energy source, a load, and wires

a battery, a light bulb, and a switch

a battery, wires, and a switch

an energy source, a resistor, and a battery

Question 11 (3 points)

Listen
Which circuit has different loads that are located on separate branches?

Question 11 options:

open circuit

open load

series circuit

parallel circuit

Question 12 (3 points)

Listen
If you rub a glass rod with a piece of silk, the rod becomes positively charged. Which of the following answer choices correctly identifies why the rod is positively charged?

Question 12 options:

Glass attracts more protons.

The silk has become negatively charged.

Protons have moved to the rod.

The friction destroyed electrons in the rod.

Question 13 (3 points)

Listen
A student connects four AA batteries (1.5 V each) in series to light up a light bulb. The circuit has a resistance of 50 Ω. How much current flows through the circuit?

Question 13 options:

0.12 A

0.03 A

300 A

75 A

Question 14 (3 points)

Listen
Students want to build a simple motor to demonstrate the relationship between magnetism and electricity. Each student group has a wooden block, paper clips, a battery, and some copper wire. What additional material is necessary to build a simple motor?

Question 14 options:

An iron nail is necessary to act as the electrical circuit load.

A magnet is necessary to produce a permanent magnetic field.

An iron nail is necessary to produce a temporary magnetic field.

A magnet is necessary to act as the electrical circuit load.

Question 15 (3 points)

Listen
Suppose you have four bulbs in a parallel circuit, each on it's own branch. If you were to add five more bulbs on separate wires in parallel with these four branches, what would happen to the brightness of the bulbs?

Question 15 options:

The bulbs would grow brighter.

The bulbs would no longer glow.

The bulbs would grow dimmer.

The brightness would not change.

Question 16 (3 points)

Listen
During a classroom lab activity, students built each of the circuits shown below and measured the current and resistance in each circuit. Each circuit contains a 1.5-volt battery and each bulb has a resistance of 50Ω.



When the switch is closed, in which circuit would resistance be the highest and current be lowest?

Question 16 options:

I

II

IV

III

Question 17 (6 points)

Listen
Mrs. Hogan has given you a box of materials and challenged you to use the materials to determine what effect increasing the current in a wire has on the magnetic field generated around the wire. Describe how you can use some, or all, of the materials to determine what effect increasing the current in a wire has on the magnetic field generated around the wire. In your description, be sure to include the following:

Describe how you would use 4 of the materials you choose. (6 total pts)

4 points for identifying the correct materials to use for this investigation

2 points for explaining how it would work

Materials in the Box

4 batteries

wire

directional compass

10 iron nails

a strong permanent magnet

a weak permanent magnet

a box of paper clips



Question 17 options:

Question 18 (3 points)

Listen
Use the information to answer the following question.

A student builds an electromagnet using a battery, a plastic nail, and some thin insulated wire. The wire is wrapped around the nail 10 times and then connected to the battery.

What changes could the student make to increase the strength of the electromagnet? Select up to 3 answers.

Select 3 correct answer(s)
Question 18 options:

place a small magnet near the battery

replace the insulated wire with a wire that has less resistance

increase the length of the wire

wrap more loops of wire around the nail

decrease the voltage of the battery

replace the plastic nail with an iron nail

Answer 1

Here are the answers to your questions:

Question 1: What causes clothes to stick together when you pull them out of the dryer?

• Answer: static electricity

Question 2: Which of the following transformations is correct in a generator?

• Answer: mechanical to electrical

Question 3: Which of the answers correctly states the law of electric charges?

• Answer: Like charges repel and opposite charges attract.

Question 4: What is the buildup of charges on an object called?

• Answer: static electricity

Question 5: If one of the bulbs in the circuit pictured above went out, the other one would stay on.

• Answer: True (assuming it's a parallel circuit)

Question 6: Charging by ____ occurs when electrons are transferred from one object to another by direct contact.

• Answer: conduction

Question 7: Which of the following actions will cause a magnet to become demagnetized?

• Answer: heating it up

Question 8: What do you call a magnet with an iron core that is produced by an electric current?

• Answer: electromagnet

Question 9: Where are the magnetic effects of bar magnets the strongest?

• Answer: ends

Question 10: What do all circuits need to function?

• Answer: an energy source, a load, and wires

Question 11: Which circuit has different loads that are located on separate branches?

• Answer: parallel circuit

Question 12: If you rub a glass rod with a piece of silk, the rod becomes positively charged. Which of the following answer choices correctly identifies why the rod is positively charged?

• Answer: The silk has become negatively charged.

Question 13: A student connects four AA batteries (1.5 V each) in series to light up a light bulb. The circuit has a resistance of 50 Ω. How much current flows through the circuit?

• Answer: 0.12 A (Using Ohm's law: V = IR, combined voltage = 4*1.5V = 6V, so I = V/R = 6/50 = 0.12 A)

Question 14: Students want to build a simple motor to demonstrate the relationship between magnetism and electricity. What additional material is necessary to build a simple motor?

• Answer: A magnet is necessary to produce a permanent magnetic field.

Question 15: If you were to add five more bulbs on separate wires in parallel with the four branches, what would happen to the brightness of the bulbs?

• Answer: The brightness would not change. (Each bulb in parallel gets the same voltage.)

Question 16: When the switch is closed, in which circuit would resistance be the highest and current be lowest?

• Answer: This requires additional context or a description of the circuits, but generally, in a series circuit, you would see higher total resistance, which leads to lower current if all circuits are closed.

Question 17: Materials you could use for the investigation:

• Materials to use:
  1. Wire
  2. Batteries (4)
  3. Directional compass
  4. Iron nails
• Explanation of how it would work:
  1. Connect the wire to the batteries to create a circuit, allowing current to flow through the wire.
  2. Wrap the wire around one of the iron nails to form an electromagnet.
  3. Use the directional compass to observe the direction and strength of the magnetic field generated around the wire and near the nail.
  4. Increase the current by adding batteries in series or by using thicker wires to see the change in magnetic field strength, which can be indicated by movement of the compass needle.

Question 18: What changes could the student make to increase the strength of the electromagnet?

• Answers:
  1. replace the insulated wire with a wire that has less resistance
  2. wrap more loops of wire around the nail
  3. replace the plastic nail with an iron nail

Make sure to verify the answers based on your course materials, as specific instructions and contexts may vary.