Children's Encyclopedia1976 |
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Pàgina 15
... electricity . This electricity goes through a transformer which builds up the voltage of the electricity . This makes it easier to send the electricity through the grid wires all over the country . Before the electricity reaches our ...
... electricity . This electricity goes through a transformer which builds up the voltage of the electricity . This makes it easier to send the electricity through the grid wires all over the country . Before the electricity reaches our ...
Pàgina 55
... Electric locomotives are driven by powerful electric motors . They are connected to an electricity supply by overhead wires or by a third ' live ' rail . Until the beginning of this century the railways had no rivals . Then the motor ...
... Electric locomotives are driven by powerful electric motors . They are connected to an electricity supply by overhead wires or by a third ' live ' rail . Until the beginning of this century the railways had no rivals . Then the motor ...
Pàgina 57
... electric car above can run for a few hours at a slow speed . One of the main troubles with the gas engine is that it gives out gas that poisons the air we breathe . The electric engine is quiet and it doesn't make poisonous gas . But it ...
... electric car above can run for a few hours at a slow speed . One of the main troubles with the gas engine is that it gives out gas that poisons the air we breathe . The electric engine is quiet and it doesn't make poisonous gas . But it ...
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