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Direct Current (DC) and Alternating Current (AC).

Direct Current (DC) and Alternating Current (AC). Direct Current (DC). Direct Current is a flow of charge that always flows in one direction A DC current is a current that does not change direction in time.

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Direct Current (DC) and Alternating Current (AC).

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  1. Direct Current (DC) and Alternating Current (AC).

  2. Direct Current (DC) • Direct Current is a flow of charge that always flows in one direction • A DC current is a current that does not change direction in time. • A battery produces direct current in a circuit. Example: Portable flashlight circuit.

  3. Alternating Current (AC) • An Alternating Current (AC) current is a current that changes direction in time. • If the high & low voltage terminals switch locations periodically, the current will flow back and forth in the circuit. This is called alternating current (AC).

  4. Alternating Current • In alternating current (AC) electrons in a circuit move in one directions and then in opposite direction, alternating back and forth about relatively fixed position. • Alternating current is accomplished by alternating polarity voltage at the generator or other voltage source. • AC current flows in your home.

  5. AC in the USA • In public power distribution systems in the United States, (including household current), the voltage reverses itself 60 times per second. In some countries, the voltage reverses itself 50 times per second. • Normal outlet voltage in the US is 110-120 volts, although some large household appliances run on 220-240 volts.

  6. Converting AC and DC • The current in your home is AC. The current in a battery operated device is DC. AC is converted to DC using devices called diodes, which allow charges to move in only 1 direction. • Diode is a tiny electronic device that acts a one way valve to allow electron flow in only one direction. • Because alternating current vibrate in two directions , only half of each cycle will pass through a diode. A capacitor is used to have continuous current.

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