The " " j " phase indicates that the AC voltage " V " = " ZI " lags the AC current by 90?: the positive current phase corresponds to increasing voltage as the capacitor charges; zero current corresponds to instantaneous constant voltage, etc.
22.
Up to 40 percent of Americans with HIV _ 300, 000 to 400, 000 people _ are believed to be infected with the hepatitis C virus, or HCV . Among some groups, primarily HIV-positive current and former intravenous drug users, the co-infection rate is thought to be about 90 percent.
23.
Kelvin, located at the western end, believed that it was necessary to employ only a low voltage and to detect the rising edge of the current flowing out of the cable and, once this had been done, nothing would be gained by further monitoring ( Morse code used a positive current for a'dot'and a negative current for a'dash').
