A particular circuit is made up of a battery, a switch, a buzzer, and wires connecting the components. All of the components are in working order, but the buzzer does not make noise. Which statement explains this observation?(1 point)
Responses
The switch is open.
The switch is open.
The load cannot convert electrical energy.
The load cannot convert electrical energy.
The circuit lacks a power source.
The circuit lacks a power source.
The conductors are not attached.
23 answers
The load cannot convert electrical energy.
Solar cells are used to power a person’s house. Which statement about the process is correct?(1 point)
Responses
Energy from the sun might be less than the energy needs of the house, but solar cells make up for this difference.
Energy from the sun might be less than the energy needs of the house, but solar cells make up for this difference.
Energy from the sun might be greater than the energy needs of the house because some energy is destroyed in the process.
Energy from the sun might be greater than the energy needs of the house because some energy is destroyed in the process.
Energy from the sun might be greater than the energy needs of the house, so some energy will be stored and/or wasted.
Energy from the sun might be greater than the energy needs of the house, so some energy will be stored and/or wasted.
Energy from the sun will equal the energ
Responses
Energy from the sun might be less than the energy needs of the house, but solar cells make up for this difference.
Energy from the sun might be less than the energy needs of the house, but solar cells make up for this difference.
Energy from the sun might be greater than the energy needs of the house because some energy is destroyed in the process.
Energy from the sun might be greater than the energy needs of the house because some energy is destroyed in the process.
Energy from the sun might be greater than the energy needs of the house, so some energy will be stored and/or wasted.
Energy from the sun might be greater than the energy needs of the house, so some energy will be stored and/or wasted.
Energy from the sun will equal the energ
y needs of the house because solar cells are 100% efficient.
Energy from the sun might be greater than the energy needs of the house, so some energy will be stored and/or wasted.
Energy from the sun might be greater than the energy needs of the house, so some energy will be stored and/or wasted.
Which energy transformation happens when a toaster is plugged in to an outlet in the wall and used to make toast?
The electrical energy from the outlet is transformed into thermal energy to toast the bread.
Which material is a composite?(1 point)
Responses
gold
gold
aluminum
aluminum
silicon
silicon
polycarbonate
Responses
gold
gold
aluminum
aluminum
silicon
silicon
polycarbonate
polycarbonate
ARE YOU SURE.
Yes, I am sure. Polycarbonate is a type of plastic that consists of multiple materials combined to form a composite material.
What happens to some metals when the kinetic energy of their particles is decreased?(1 point)
Responses
They contract.
They contract.
They melt.
They melt.
They conduct.
They conduct.
They expand.
Responses
They contract.
They contract.
They melt.
They melt.
They conduct.
They conduct.
They expand.
They contract.
Are you sure?
Yes, I am sure. When the kinetic energy of particles in a metal is decreased, the particles slow down and move closer together. This results in a decrease in the volume of the metal, which is known as contraction.
Aluminum allows for the flow of electrons, while glass does not. Would an aluminum wire surrounded by glass be an effective design for a device that will need to carry an electric current?(1 point)
Responses
Yes, it would. The glass would carry the current, while aluminum is an insulator.
Yes, it would. The glass would carry the current, while aluminum is an insulator.
No, it would not. Both aluminum and glass are insulators, so the device would not carry a current.
No, it would not. Both aluminum and glass are insulators, so the device would not carry a current.
No, it would not. Both aluminum and glass are conductors, so the current would be exposed to outside elements.
No, it would not. Both aluminum and glass are conductors, so the current would be exposed to outside elements.
Yes, it would. Aluminum is a conductor, and the glass would prevent electricity from transferring to a person holding the device.
Responses
Yes, it would. The glass would carry the current, while aluminum is an insulator.
Yes, it would. The glass would carry the current, while aluminum is an insulator.
No, it would not. Both aluminum and glass are insulators, so the device would not carry a current.
No, it would not. Both aluminum and glass are insulators, so the device would not carry a current.
No, it would not. Both aluminum and glass are conductors, so the current would be exposed to outside elements.
No, it would not. Both aluminum and glass are conductors, so the current would be exposed to outside elements.
Yes, it would. Aluminum is a conductor, and the glass would prevent electricity from transferring to a person holding the device.
No, it would not. Both aluminum and glass are insulators, so the device would not carry a current.
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Which purpose does a light bulb serve in a circuit?(1 point)
Responses
cell
cell
switch
switch
wire
wire
load
Responses
cell
cell
switch
switch
wire
wire
load
load
Electromagnet Current Intensity Number of Turns
P medium 20
Q low 20
R low 15
Which list shows the electromagnets in order from strongest magnetic force to weakest magnetic force?
(1 point)
Responses
Q, R, P
Q, R, P
R, Q, P
R, Q, P
P, Q, R
P, Q, R
R, P, Q
P medium 20
Q low 20
R low 15
Which list shows the electromagnets in order from strongest magnetic force to weakest magnetic force?
(1 point)
Responses
Q, R, P
Q, R, P
R, Q, P
R, Q, P
P, Q, R
P, Q, R
R, P, Q
P, Q, R. The strength of an electromagnet depends on the current intensity and the number of turns in the wire. Electromagnet P has both the highest current intensity and the highest number of turns, making it the strongest. Electromagnets Q and R both have low current intensity, but Q has more turns than R, making it stronger. Therefore, the order from strongest to weakest is P, Q, R.
How is an electromagnetic field produced?(1 point)
Responses
when a conductor interacts with a magnet
when a conductor interacts with a magnet
when particles are arranged around a conductor
when particles are arranged around a conductor
when an object has an electrical charge
when an object has an electrical charge
when a current runs through a conductor
when a current runs through a conductor
Responses
when a conductor interacts with a magnet
when a conductor interacts with a magnet
when particles are arranged around a conductor
when particles are arranged around a conductor
when an object has an electrical charge
when an object has an electrical charge
when a current runs through a conductor
when a current runs through a conductor
when a current runs through a conductor
1 answer