Science inventions

telephone messages of the world simultaneously.

Amplification - усиление
Emission - излучение
To vaporize - испарять
Lead - свинец
Unamenable - неподдающийся

And now the second group asks the third group some questions.
Solar-powered lamps.
1) How do solar-powered lamps work? (They work by using energy accumulated during the day from a solar panel. )
2) What is the advantage of sun-powered lamps? (The advantage of sun-powered lamps is that they can bring light to areas distant from any other power supply. )
3) Is it important to develop solar-powered devices? Why? (Yes it is, because its use doesnt pollute the environment. )
4) What is the solar panel used for? (The solar panel produces electricity which charges a battery. )
Solar-powered lamps.
Most people living in towns consider it a usual thing that streets are lit at night. But street lights need a power supply (источник энергии) therefore distant areas with no source of electricity remain in darkness until the sun comes up again. With new appliances now offered by several British firms, many distant places could be lit with solar-powered street lights. It may seem strange that the lamps can use the power of the sun which shines by day when the lamps are needed at night, but they work by using energy accumulated during the day from a solar panel. The solar panel produces electricity which charges(заряжает) a battery. When the sun goes down the battery power is then used for lighting. Each lamp has its own panel so the system can be used for one individual light or a number of them.
The generation of electricity by batteries is still expensive but the advantage of sun-powered lamps is that they can bring light to areas distant fro