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.
1 AC, or alternating current means the electrical current is alternating directions in a repetitive pattern. 2  AC is created by generators in power plants, and other sources. 3  This AC current is delivered to our homes and businesses by the power lines we see everywhere.