Hawkins Electrical Guide v. 05 (of 10) / 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

by N. Hawkins

Since the time of a period = 1 ÷ frequency, the time of one-quarter of a period is ¼ × (1 ÷ frequency), or

¼ period = ¼ f (2)

f, being the symbol for frequency. Substituting (2) in (1)

maximum charge = I_av × ¼f (3)

The pressure of a condenser is equal to the quotient of the charge divided by the capacity, that is

		charge
condenser pressure	=		(4)
		capacity

Substituting (3) in (4)

		⎛			1	⎞				Iav
condenser pressure	=	⎜	Iav	×		⎟	÷	C	=		(5)
		⎝			4f	⎠				4fC

But, I_av = I_max × 2 / π, and substituting this value of I_av in equation (5) gives