large/12904/worldswithinworlds_v1-3_1904_librivox_64kb_mp3/worldswithinworlds_01_asimov_64kb_52
large/12904/worldswithinworlds_v1-3_1904_librivox_64kb_mp3/worldswithinworlds_01_asimov_64kb
English
12904
In order to detect the electricity, the current ought to be forced across a gap containing nothing, not even air. IN ORDER TO DETECT THE ELECTRICITY THE CURRENT OUGHT TO BE FORCED ACROSS A GAP CONTAINING NOTHING NOT EVEN AIR
ys An electric current flows through a closed circuit of some conducting material, such as metal wires. It starts at one pole of a battery, or of some other electricity generating device, and ends at the other. The two poles are the positive pole or “anode” and the negative pole or “cathode”. If there is a break in the circuit, the current will usually not flow at all. If, however, the break is not a large one, and the current is under a high driving force (which is called the “voltage”), then the current may leap across the break. If two ends of a wire, making up part of a broken circuit, are brought close to each other with nothing but air between, a spark may leap across the narrowing gap before they actually meet and, while it persists, the current will flow despite the break. The light of the spark, and the crackling sound it makes, are the results of the electric current interacting with molecules of air and heating them. Neither the light nor the sound is the electricity itself. HE UNIT AN ELECTRON CATHODE RAYS AN ELECTRIC CURRENT FLOWS THROUGH A CLOSED CIRCUIT OF SOME CONDUCTING MATERIAL SUCH AS METAL WIRES IT STARTS AT ONE POLE OF A BATTERY OR OF SOME OTHER ELECTRICITY GENERATING DEVICE AND ENDS AT THE OTHER THE TWO POLES ARE THE POSITIVE POLE OR ANNODE AND THE NEGATIVE POLE OR CATHODE IF THERE IS A BREAK IN THE CIRCUIT THE CURRENT WILL USUALLY NOT FLOW AT ALL IF HOWEVER THE BREAK IS NOT A LARGE ONE AND THE CURRENT IS UNDER A HIGH DRIVING FORCE WHICH IS CALLED THE VOLTAGE THEN THE CURRENT MAY LEAP ACROSS THE BREAK IF TWO ENDS OF A WIRE MAKING UP PART OF A BROKEN CIRCUIT ARE BROUGHT CLOSE TO EACH OTHER WITH NOTHING BUT AIR BETWEEN A SPARK MAY LEAP ACROSS THE NARROWING GAP BEFORE THEY ACTUALLY MEET AND WHILE IT PERSISTS THE CURRENT WILL FLOW DESPITE THE BREAK THE LIGHT OF THE SPARK AND THE CRACKLING SOUND IT MAKES ARE THE RESULTS OF THE ELECTRIC CURRENT INTERACTING WITH MOLECULES OF AIR AND HEATING THEM NEITHER THE LIGHT NOR THE SOUND IS THE ELECTRICITY ITSELF
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