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Summary of formulas
Capacitor color coding
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a-c circuit a-c meter a-c voltage allows alternating current ammeter amount of current amplifier anode armature armature current atoms basic battery brushes called capacitance capacitor cathode cause color commutator conductor connected in series core counter-emf current flow cycles d-c motor decreased device dielectric field diode direct current dry cell effect electrolyte electrolytic capacitor electromagnet electrons energy farad field coils field rheostat filament flux formula frequency fuse germanium heat increased inductive reactance inductor input insulator iron lamp line voltage lines of force load magnetic field metal move negatively charged occurs Ohm's law ohms operation oscillator output voltage p-n-p transistor parallel phase plate current polarity pole positively charged power factor produced reading rectifier resistance resistor resonant circuit reverse rheostat rotation rotor shown in Fig shunt signal slip rings solenoid speed switch three-phase torque transformer transistor triode unit vacuum tube voltage drop voltmeter volts watts wire zero