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alternating current aluminium apply armature binary cables calculated capacitance capacitor cell centimetre characteristic circuit breakers coefficient components connection constant control current converter cooling copper cross section cubic curve desired value determined devices diagram diameter earth electrical electrode energy enthalpy equation equipment factor flow flux density frequency fuel function Hall plate Hall voltage heat hysteresis impedance induction input installations insulation kcal/kg load loop luminous flux machine magnetic field material maximum means measuring meter metre moment of inertia motor no-load operating output overhead line permissible pipe pound-force pressure quantity radiation rated current rated voltage ratio reactance reactive reactive power reactor rectifier resins resistance rotor sheath short-circuit current Siemens Siemens AG signal speed square steam steel switching symmetrical Table temperature rise thermal three-phase thyristor torque transformer turbine unit vector ventilator voltage welding winding wire