Elementary Magnetism And Electricity Prepared in the Extension Division of the
Elementary Magnetism And Electricity Prepared in the Extension Division of the
Cyril Methodius Jansky
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These differences make the instrument more sensitive, accurate, and convenient. Since this is the first time that the student is asked to use a delicate instrument, some instruction for its use will be given. First examine the volt-ammeter and observe that it has 3 binding posts, one marked +, the one next to it marked A, and the third marked V. In connecting this instrument to a circuit always CURRENT ELECTRICITY 93 connect the + post to the wire that is connected to the carbon, copper, or pos...itive terminal of the cell or other source of e. M. F. Never connect the post A to the zinc terminal of a cell unless some resistance is included in the circuit. If you should connect a dry cell directly to posts + and A, the current through the instrument may be too large and the instrument may be damaged. While one cell alone may not cause serious trouble, more than one undoubtedly will cause damage. Never connect this instrument to a house-lighting circuit. The meter is not designed for such use, and if so connected it will undoubtly be burned out.
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