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2. Electric current - Wikipedia

   en.wikipedia.org/wiki/Electric_current

   In other media, any stream of charged objects (ions, for example) may constitute an electric current. To provide a definition of current independent of the type of charge carriers, conventional current is defined as moving in the same direction as the positive charge flow. So, in metals where the charge carriers (electrons) are negative ...

3. Direct current - Wikipedia

   en.wikipedia.org/wiki/Direct_current

   An electrochemical cell is a prime example of DC power. Direct current may flow through a conductor such as a wire, but can also flow through semiconductors, insulators, or even through a vacuum as in electron or ion beams. The electric current flows in a constant direction, distinguishing it from alternating current (AC).

4. Electricity - Wikipedia

   en.wikipedia.org/wiki/Electricity

   Electricity plays a central role in many modern technologies, serving in electric power where electric current is used to energise equipment, and in electronics dealing with electrical circuits involving active components such as vacuum tubes, transistors, diodes and integrated circuits, and associated passive interconnection technologies.

5. Alternating current - Wikipedia

   en.wikipedia.org/wiki/Alternating_current

   The usual waveform of alternating current in most electric power circuits is a sine wave, whose positive half-period corresponds with positive direction of the current and vice versa (the full period is called a cycle). "Alternating current" most commonly refers to power distribution, but a wide range of other applications are technically ...

6. Constant current - Wikipedia

   en.wikipedia.org/wiki/Constant_current

   In electronics, a constant current system is one that varies the voltage across a load to maintain a constant electric current.When a component is indicated to be driven by a constant current, the driver circuit is, in essence, a current regulator and must appear to the component as a current source of suitable reliability.

7. Glossary of power electronics - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_power_electronics

   A DC converter where the energy is transferred from the source side to the load side during the conduction interval(s) of the controllable principal arm(s). four-quadrant converter An AC/DC or DC converter with two directions of DC power flow, associated with two directions of direct voltage and two directions of direct current. free-wheeling arm

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9. Ampere - Wikipedia

   en.wikipedia.org/wiki/Ampere

   As of the 2019 revision of the SI, the ampere is defined by fixing the elementary charge e to be exactly 1.602 176 634 × 10 −19 C, [6] [9] which means an ampere is an electric current equivalent to 10 19 elementary charges moving every 1.602 176 634 seconds or 6.241 509 074 × 10 18 elementary charges moving in a second.