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GENERAL CONSIDERATIONS1 Purpose of
MOVINGIRON METERS8 Oersteds Discovery9
MOVINGCOIL METERS24 Early Experiments
1.0 milliampere a-c and d-c a-c circuits a-c component a-c current alternating current ammeter ampere APPLICATIONS OF METERS arrangement basic calibration carrying current chapter CHARACTERISTICS OF METERS COMPONENTS OF METERS conductor connected copper-oxide rectifier current coil current flow current meter current-measuring meters d-c meters d-c resistance damping device direct current direction of current dynamometer type electric charges electrical meter ELECTRODYNAMOMETER electromagnetic electrostatic meter electrostatic voltmeter employed frequency full scale full-scale deflection heater indication instrument lines of force load magnetic field magnetic lines ment meter coil meter movement meter resistance millivolts movable moving coil moving-coil meter MOVING-IRON METERS moving-vane multipliers Ohm's law ohmmeter ohms operation overload percent pivot plate pointer potential coil PRACTICAL APPLICATIONS range reading RECTIFIERS AND THERMOCOUPLES resistor result shown in Fig shunt thermocouple meter tion total circuit resistance tube turning force type of meter values of current vane voltage drop voltage measurement voltmeter volts wattmeter zero