Solar cells are used to power a person’s house. Which statement about the process is correct?(1 point)
Responses
Energy from the sun will equal the energy needs of the house because energy is not created or destroyed.
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 because some energy is destroyed in the process.
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, so some energy will be stored and/or wasted.
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 load cannot convert electrical energy.
The circuit lacks a power source.
The switch is open.
The conductors are not attached.
The circuit lacks a power source.
The correct statement about the process of using solar cells to power a house is:
Energy from the sun might be greater than the energy needs of the house, so some energy will be stored and/or wasted.
To understand why this statement is correct, we need to consider the nature of energy and how solar cells work. Solar cells convert sunlight into electricity through a process called the photovoltaic effect. When sunlight hits the solar cells, photons from the sunlight knock electrons loose from their atoms, generating an electric current.
The amount of energy generated by solar cells is determined by the intensity of sunlight and the surface area of the solar panels. In some cases, the energy generated by the sun may be greater than what the house needs at a given time. When this happens, the excess energy can be stored in batteries or fed back into the electrical grid.
On the other hand, there may be times when the energy from the sun is less than the energy needs of the house, especially during nighttime or cloudy periods. In such cases, stored energy from batteries can be used to power the house.
So, the correct statement acknowledges that the energy from the sun might be greater than the energy needs of the house, leading to some energy being stored or wasted. This flexibility allows solar-powered houses to fulfill their energy requirements even when sunlight availability fluctuates.