**** SOLAR POWERED DEVICES
V. Ryan © 2006
Solar powered emergency ph**es can be seen through the major road network in Spain. The emergency ph**es are distributed mainly ** the motorways. The photovoltaic panels do not power the ph**es directly. They slowly charge up batteries allowing the ph**e to be used motorists unlucky enough to have cars that have broken down. Each solar panel is capable of charging a set of batteries to such an extent that the ph**e also be used at night.
This warning symbol can be seen at sharp corners. They warn drivers that they are approaching a sharp turn. This example is solar powered. Each arrow is made up of a number of LEDs. Each ‘arrow’ of LEDs flash in sequence ensuring that the driver is **** likely to see the warning symbol. The LEDs even flash during the day time and are bright enough to be seen at quite a distance. The solar panel charges up a battery system that in turn powers the electr**ic circuit.
This parking meter is similar to **es seen in Lisb**, the capital of Portugal. They work ** the same principle as the other solar powered devices shown above. Batteries power the electr**ic circuit and the ticket mechanism. The photovoltaic panel charges up the batteries during day light hours.
QUESTI**S:
1. Sketch and explain any other solar powered devices you have seen or used.
2. Design a new or existing device that can be powered by photovoltaic panels.
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