R. MAISONNEUVE, PUBLIPHOTO DIFFUSION / SCIENCE PHOTO LIBRARY R. MAISONNEUVE, PUBLIPHOTO DIFFUSION / SCIENCE PHOTO LIBRARY
Electricity transformers. A man inspects electricity power transformers. Transfor- mers change the voltage of electricity supplies. Very high voltages (tens of thousands of volts) are used in transmission lines, while domestic supplies are reduced to 110-250 volts for safety.
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