Practical Electricity: A Laboratory and Lecture Course for First Year Students of Electrical Engineering, Based on the International Definitions of the Electrical Units, Volume 1 |
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Results 1-5 of 80
Page xvii
... Constant P.D. and Constant E. M.F. 160. Independence of Currents in Parallel Circuits 161. Arrangements of Cells . 162. Mercury Switch - board for Batteries 163. Arrangement of a Given Number of Cells to produce the Maximum Current ...
... Constant P.D. and Constant E. M.F. 160. Independence of Currents in Parallel Circuits 161. Arrangements of Cells . 162. Mercury Switch - board for Batteries 163. Arrangement of a Given Number of Cells to produce the Maximum Current ...
Page 13
... constant , but if the different effects to which we have been referring vary from one time to another , then which of them shall we take to represent by the magnitude of its variations the change that has taken place in the current ...
... constant , but if the different effects to which we have been referring vary from one time to another , then which of them shall we take to represent by the magnitude of its variations the change that has taken place in the current ...
Page 25
... constant of an instrument , the current should be kept as nearly constant as possible , and the readings of the instrument taken at frequent observed intervals of time . These observations give a curve from which the reading ...
... constant of an instrument , the current should be kept as nearly constant as possible , and the readings of the instrument taken at frequent observed intervals of time . These observations give a curve from which the reading ...
Page 29
... cubic centimetres . Example 1. - How many amperes would deposit 5 grammes of copper in half an hour , the current being supposed constant ? 0 0003286 gramme is deposited in 1 second by 1 Chap . I. ] 29 ELECTROCHEMICAL EQUIVALENTS .
... cubic centimetres . Example 1. - How many amperes would deposit 5 grammes of copper in half an hour , the current being supposed constant ? 0 0003286 gramme is deposited in 1 second by 1 Chap . I. ] 29 ELECTROCHEMICAL EQUIVALENTS .
Page 42
... constant pressure on the sides of the tube causes it to acquire a permanent set and prevents it from regaining its circular form when the pinch - cock is removed . 10. Relative Advantages of Voltameters and Gal- vanometers . The ...
... constant pressure on the sides of the tube causes it to acquire a permanent set and prevents it from regaining its circular form when the pinch - cock is removed . 10. Relative Advantages of Voltameters and Gal- vanometers . The ...
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Common terms and phrases
altered ammeter amperes apparatus axis battery bobbin body brass calibration cell centre charge compass needle conductor connected constant controlling force copper cubic centimetres current flowing curve deflecting force diameter direction directly proportional earth ebonite electric current electric energy electrical efficiency electrified electrometer electroscope electrostatic employed equal example exerted experiment external circuit fixed galvano given glass Hence horizontal inch inside instrument insulated international ohms iron knob length lines of force liquid magnetic field measured metal meter method nought obtained Ohm's law P.Ds parallel permanent magnet piece pipe placed plane plate pointer points pole position relatively potential pressure produced ratio relative strengths resistance right angles scale seen in Fig shown in Fig shunt sine soft-iron sulphate sulphuric acid tangent galvanometer tangent law temperature terminals tube turned uniform vessel voltmeter volts wattmeter watts weight Wheatstone's bridge wound zero zinc zinc sulphate
Popular passages
Page 591 - Ampere, which is one-tenth of the unit of current of the CGS system of electromagnetic units and which is represented sufficiently well for practical use by the unvarying current which, when passed through a solution of nitrate of silver in water, in accordance with a certain specification, deposits silver at the rate of 0.001118 of a gramme per second.
Page 585 - As a unit of resistance, the international ohm, which is based upon the ohm equal to 10" units of resistance of the CGS system of electromagnetic units, and is represented by the resistance offered to an unvarying electric current by a column of mercury at the temperature of melting ice, 14.4521 grams in mass, of a constant cross-sectional area and of the length of 106.3 centimetres.
Page 587 - ... the electromotive force that, steadily applied to a conductor whose resistance is one international ohm, will produce a current of...
Page 586 - The unit of current shall be what is known as the international ampere, which is one-tenth of the unit of current of the centimeter-gramsecond system of electro-magnetic units, and is the practical equivalent of the unvarying current, which, when passed through a solution of nitrate of silver in water in accordance with standard specifications, deposits silver at the rate of one thousand one hundred and eighteen millionths of a gram per second.
Page 466 - ... carefully removing any loose pieces of the zinc. Just before making up the cell dip the zinc into dilute sulphuric acid, wash with distilled water, and dry with a clean cloth or filter paper.
Page 466 - Mix the washed mercurous sulphate with the zinc sulphate solution, adding sufficient crystals of zinc sulphate from the stock bottle to ensure saturation, and a small quantity of pure mercury. Shake these up well together to form a paste of the consistence of cream. Heat the paste, but not above a temperature of 30° C.