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Shop and Road Testing of Dynamos and Motors: A Practical Manual
Eugene Chilton Parham
No preview available - 2015
adjusted ammeter amperes armature balance battery becomes belt brushes cable called capacity carry cause cell closed coil commutator compound-wound conductor connected constant copper decrease deflection depends difference direction drop dynamo effect efficiency electrical energy engine equal excited fall fault field flows follows force galvanometer give given greater ground heat hence increase indicates insulation iron lamps lead length less load loss lower machine magnetic means measured meter method motor multiple necessary needle ohms pass polarity pole position potential practice proper proportion raise reading regulation removed resistance result reversed rheostat rise scale separately series field short circuit shows shunt side sparking speed standard suppose switch taken temperature terminals tion turns varying volt voltage voltmeter volts winding wire zero
Page 13 - 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.