The two types of currents named in an electric circuit are AC (alternating current) and DC (direct current).

**AC (Alternating Current):**
- Alternating current is a type of electric current that changes direction periodically.
- It is commonly used in homes and businesses to power electrical devices.
- AC current is generated by power plants and is transmitted over long distances through power lines.
- The direction of the current in an AC circuit continuously changes back and forth, typically at a frequency of either 50 or 60 cycles per second (Hz), depending on the country.
- In an AC circuit, electrons do not move in a steady flow in one direction. Instead, they oscillate back and forth, causing the current to alternate.
- The symbol for alternating current is a sine wave, representing the periodic changes in direction and magnitude of the current.

**DC (Direct Current):**
- Direct current is a type of electric current that flows in only one direction.
- It is commonly used in batteries, solar cells, and electronic devices.
- DC current is produced by chemical reactions within a battery or by converting AC current into DC using a rectifier.
- In a DC circuit, electrons flow from the negative terminal to the positive terminal of a power source in a constant direction.
- The symbol for direct current is a straight line, indicating the continuous and unidirectional flow of electrons.

**Direction of Open in Electric Circuit:**
- The term "open" in an electric circuit refers to a break or interruption in the flow of current.
- In an AC circuit, if there is an open, the circuit will be interrupted, and the flow of current will cease. This can occur if a switch is opened or a wire is disconnected.
- In a DC circuit, if there is an open, the circuit will also be interrupted, and the flow of current will stop. This can happen if there is a break in the wire or a switch is opened.
- It is important to note that an open in a circuit can be intentional, such as when a switch is turned off, or unintentional, such as when there is a faulty connection or a broken wire.
- In both AC and DC circuits, if there is an open, the circuit will not function properly as the current cannot complete its path.

AC and DC current. mainly we use AC current.