Question

david ma, an engineer at the university of hawaii in manoa, knew that its possible to generate electricity by creating friction, or rubbing two things together. so, he thought, \why dont we use water?\ heres how mas plan works. a drop of water sliding across a surface coated with two different materials would generate enough friction to create an electrical charge. so if metal wires are placed on that surface, and water droplets touch them as they move, harvesting electricity should be possible, ma reasoned. \its a very simple idea,\ he says. and it worked. in fact, mas researchers lit up 15 led light bulbs with a single moving water droplet. according to christopher oshman, a mechanical engineer at the colorado school of mines in golden, \the work is a step toward harvesting the energy of moving objects all around us, including ourselves, to power the electronic devices we use every day.\ so someday soon, you might be able to power these without a charger. complete the sentences to summarize how water can be used to generate electricity. it is possible to generate electricity by to create friction. a water droplet moving across a surface creates friction and . this energy is transferred through wires to

Explanation:

The text explains that David Ma, an engineer, thought of using water to generate electricity. A water droplet sliding on a surface with two different materials creates friction, which generates an electrical charge. This charge (energy) can be transferred through wires (as metal wires are placed on the surface and water droplets touch them as they move) to power devices (like the 15 LED light bulbs that were lit up).

Answer:

rubbing two things together; creates an electrical charge; power devices.