The correct answer is: A. Alternating Current and Direct Current
Alternating current (AC) is an electric current that reverses its direction periodically. Direct current (DC) is an electric current that flows in one direction only.
AC is the type of current that is used in most homes and businesses. It is generated by rotating a coil of wire inside a magnetic field. The rotation of the coil causes the current to alternate between positive and negative.
DC is the type of current that is used in batteries and some electronic devices. It is generated by a chemical reaction or by a solar cell.
AC and DC are both important types of electricity. AC is used for power transmission and distribution, while DC is used for powering electronic devices.
Option B is incorrect because AC and DC are not a rock band from Australia.
Option C is incorrect because AC and DC are not average current and discharged capacitor.
Option D is incorrect because AC and DC are not Atlantic City and District of Columbia.