Question

energy from the sun can be used instead of fossil fuels to produce electricity. however, most devices that convert solar energy into electricity only work when the sun is out.
to improve solar energy technology, scientists have developed a solar flow battery. this device absorbs solar energy and converts it into electrical energy that can be used immediately. if no electricity is needed, the device converts the energy into a stored chemical energy that can be used later to produce electricity.
what is an advantage of the solar flow battery?
a. it allows solar energy to be used to produce electricity at night.
b. it increases the rate at which solar energy can be converted into electricity.
c. it decreases the cost of using solar energy to generate electricity.
d. it helps solar energy to perform chemical reactions like creating fossil fuels.

Explanation:

A solar flow battery stores energy. When the Sun is out, solar energy is converted into electrical energy. If no electricity is needed immediately, the device converts the energy into stored chemical energy that can be used later to produce electricity. This addresses the issue of solar - powered devices only working when the Sun is out. Option A correctly describes this advantage as it allows solar energy (stored as chemical energy in the battery) to be used to produce electricity at night (or when the Sun is not shining). Option B is incorrect because the solar flow battery itself does not increase the rate of solar - to - electricity conversion (that is more related to solar panel efficiency). Option C is incorrect as there is no information in the description about the battery decreasing the cost of using solar energy to generate electricity. Option D is incorrect because the battery does not help solar energy perform chemical reactions like creating fossil fuels; its function is energy storage for electricity production.

Answer:

A. It allows solar energy to be used to produce electricity at night.