Most people living in towns consider it a usual thin 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 (заряжать) 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.
In the south of Saudi Arabia a motorway tunnel miles from any power supply is lit day and night by solar-powered devices. The solar panels provide power during the day and charge batteries which accumulate enough power to light the tunnel at night. 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 from any other power supply.
There is one more advantage of solar power: not only it is unlimited, but also its use does not pollute the environment. That is why it is very important to develop devices which make it possible to transform solar power into mechanical or electric forms of power.
Answer the questions:
1. What do the lamps use which shines by day?
2. What the does the solar panel produce?
3. What is the battery pervert used?
4. What are the advantage of sun power lamps?
5. How can the systems be used for?
Test
1. Street lights need ___
a) Batteries
b) A supple
c) Transformers
d) Wires
2. The can use the power of the ____
a) Star
b) Moon
c) Sun
d) Space
3. Solar power doesn’t pollute the ___
a) Environment
b) Forest
c) Streets
d) Factories
4. With new appliances offered by ___ firms
a) American
b) Russian
c) Trench
d) British
5. Battery power is used for
a) Television
b) Radio
c) Lighting
d) Telephone