. 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. :-nit. If as - Qiu-^. Is it necessary to ha?c ■ continuous metalliccircuit fof an alternating current? No, it is possible for an alternating current to flowthrough a circuit which is divided at some point by insulating -—-• ALTERXATIXG CURRENT! 1,041 Ques. How can the current flow under such condition? Ans. Its flow depends on the capacity of the circu
. 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. :-nit. If as - Qiu-^. Is it necessary to ha?c ■ continuous metalliccircuit fof an alternating current? No, it is possible for an alternating current to flowthrough a circuit which is divided at some point by insulating -—-• ALTERXATIXG CURRENT! 1,041 Ques. How can the current flow under such condition? Ans. Its flow depends on the capacity of the circuit andaccordingly a condenser may be inserted in the circuit as infig. , thus interposing an insulated gap, yet permitting analternating flow in the metallic portion of the circuit. RESERVOIR ^ -RUBBER DIAPHRAGM. Fig. —Hydraulic analogy illustrating capacity in an alternating current circuit. Achamber containing a rubber diaphragm is connected to a double acting cylinder and thesystem filled with water. In operation, as the piston moves, say to the left from thecenter, the diaphragm is displaced from its neutral position N, and stretched to someposition M, in so doing offering increasing resistance to the flow of water. On thereturn stroke the flow is reversed and is assisted by the diaphragm during the first halfof the stroke, and opposed during the second half. The diaphragm thus acts with the3ow of water one-half of the time and in opposition to it one-half of the time. Thiscorresponds to the electrical pressure at the terminals of a condenser connected in analternating current circuit, and it has a maximum value when the current is zero and azero value when the current is a maximum. Ques. Name the unit of capacity and define it. Ans. The unit of capacity is called the farad and its
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