. Hawkins electrical guide. Questions, answers & illustrations; a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications; a practical treatise. AWAr—nytymy^i R Xf .-r^CITY t : ■ - ■ ,z containing resistance. inductance, and capac-the impedance of this am ---:: is Z = > R: — Xt - Xc I in; R = resistance; X< = inductance wemtitmmoe; Xf = capacitypedence when R = 4. Xj = az . 22,2 ohms, Where the ohmic values of induc- Z = . : and capacity are gives as is this example, the f»lf-U*in« of to
. Hawkins electrical guide. Questions, answers & illustrations; a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications; a practical treatise. AWAr—nytymy^i R Xf .-r^CITY t : ■ - ■ ,z containing resistance. inductance, and capac-the impedance of this am ---:: is Z = > R: — Xt - Xc I in; R = resistance; X< = inductance wemtitmmoe; Xf = capacitypedence when R = 4. Xj = az . 22,2 ohms, Where the ohmic values of induc- Z = . : and capacity are gives as is this example, the f»lf-U*in« of to first calculate their ohmic values as is figs .• ImpManop = % tf - V = | 10 ohms. b will flow through the o ihms law using impedance in the same way as resistance. - ■ -. .: - 10 o. t = 10 amperes. ALTERNATING CURRENTS 1,059 Th-3 reactance is not always given but instead in some problems thefrequency of the current and inductance of the circuit. An expressionto fit such cases is obtained by substituting 2 irfL for the reactance asfollow?: (using symbols for impedance and resistance) Z= VR3 + C2x/L)« (2) INDUCTANCE. RESISTANCE •WWW 6 OHMS ALTERNATOR Fig. 1,298.—Diagram of circuit for example II. EXAMPLE II.—If an alternating current, having a frequency of 60,be impressed on a coil whose inductance is .05 henry and whose resistanceis 6 ohms, what is the impedance? Here R =6; / = 60, and L = .05; substituting these values in (2) Z= V 62 + (2 w X 60 X .Ooj3 = V 393*= ohms. CONDENSER
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