Human-made devices that use solar energy to excite and move electrons across a one-way electrostatic barrier, thus creating an electrical potential and an electrical current, are called cells.

explanation:

a fuel engine ( known as a gasoline engine in american english )is an internal combustion engine with spark ignition, designed to run on petrol (gasoline) and similar volatile fuels.

c.the charges if the proton and electron and gravity

answer: i'm not sure which is which for i get confused on it all the time but i can tell you that the answer lies with the convex and concave devices. i hope this you. have a good day and best of luck to you!

explanation:

c because the news are a source of information of things that happen on the daily and shows evidence about that particular topic