TELCO S/P ckt 4 E77 DEMO dwg-6

TELCO: S/P ckt 4 E77 DEMO page S/P R-01 2....dwg-6 Fifth simplification Parallel: Req5=Req3 || to Req4, Req5=product/(sum)=5x20/(5+20)Ohms = 100/25 Ohms = 4 Ohms. So, EReq5=EReq3=IReq4.