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alternating current ampere amplifier angle anode applied atomic axis capacitance carrier wave cathode cell centimeters charge circuit coil commonly component condenser conductor connected consists constant copper curve cycles deflection determine diagram dielectric direct current direction effect elec electrical electrolyte electromagnetic electrometer electrons electrostatic element emf developed emission energy equal equation expression factor field intensity field strength force frequency function galvanometer given grid heat hence hydrogen indicated inductance instrument involved ionization ions known load magnetic field magnitude material means mechanical metal meter negative Ohm's law ohms operation oscillator parallel pole positive potential difference potentiometer quantity radiation radioactive radius ratio rays reactance referred relation represents resistance resistor result rotating secondary shown in Fig sketched in Fig solution statcoulombs statvolts surface temperature terminals thermocouple tion transformer triode tube unit utilized vector velocity voltage volts wave length winding wire zero