The Index consists of liquid United States dollar-denominated, high yield corporate bonds for sale in the United States, as determined by International Index Company Limited. HTG is based in Boston, MA.
In direct current (DC), the electric charge (current) only flows in one direction. Electric charge in alternating current (AC), on the other hand, changes direction periodically. The voltage in AC circuits also periodically reverses because the current changes direction. Most of the digital electronics that you build will use DC.
Its fields also cycle at 60 Hz and are referred to as Extremely Low Frequency (ELF) fields.Direct current (DC) is constant, like current from a battery. Its electric and magnetic fields are also constant (frequency of zero) and are referred to as static fields.