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FOR MANAGERS AND OPERATORS 7 Fix it firmly in your mind that the term "VOLT" MEANS PRESSURE and nothing else but pressure, just exactly as pounds means pressure in a water pipe or a steam boiler, and that "AMPERES" MEANS VOLUME, OR QUANTI- TY, of current Howing, exactly as gallons would mean the •ciuantity of water flowing in a water pipe. Electric current has both pressure and volume, exactly the same as has water in a watermain, and the terms volt and ampere mean in electrical practice precisely the same thing as do pounds and gallons when applied to a water- main carrying water under pressure. The "ohm" is the term used to express resistance to the passage of an electric current. Current in passing through a wire meets with resistance, just as a water pipe offers re- sistance to the flow of water through friction. This resistance is expressed in ohms. The term "Watt" is used to measure the amount of work performed by an electric current. In other words, it means electro-motive force or horsepower. Merely for the sake of convenience the term "kilo-watt" is much used, meaning 1,000 watts. A watt is 1/746 of a horsepower. DEFINITIONS OF TERMS. These definitions are the clearest, simplest the writer has been able to discover after a search of many standard works on electricity. He believes that a close inspection of them will enable the average man to arrive at a pretty close under- standmg of what the terms really mean. At any rate they cannot be put in simpler language. VOLT: The practical unit of electric pressure, or electro- motive force. The pressure required to move one ampere against a resistance of one ohm. The electro-motive force in- duced in a conductor, usually an armature coil, which is cutting 100,000,000 magnetic lines (of force) per second. AMPERE: The unit of electric current (quantity or volume). That amount of current which can be driven by a pressure of one volt, the unit of electric pressure or electro- motive force, through one ohm, the unit of electric resistance. Such a rate of flow of electricity as would transmit one coulomb per second (a coulomb is defined as the unit of electrical quantity. That quantity of current which would