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.
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
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.
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
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.