Electric current is rate of flow of negatively-charged particles, called electrons, through a predetermined cross-sectional area in a conductor.
Mathematically, i = dq/dt
The charge transferred between time t0 and t is obtained by integrating both sides of equation. We obtain,
Calculating current
The SI unit of quantity of electric current is the ampere (A).
1 ampere = 1 coulomb/second
or, I=Q/t
where:
I is the current in amperes (amps), A
Q is the charge in coulombs, C
t is the time in seconds, s
Direct Current (DC)
An electrical current can flow in either of two directions. If it flows in only one direction, it is called direct current.
Alternating Current (AC)
A current which alternates in direction or polarity is called an alternating current.
Note: Direct current is represented by I and alternating current is represented by i.
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| Electron flow in a circuit |
Mathematically, i = dq/dt
The charge transferred between time t0 and t is obtained by integrating both sides of equation. We obtain,
Calculating current
The SI unit of quantity of electric current is the ampere (A).
1 ampere = 1 coulomb/second
or, I=Q/t
where:
I is the current in amperes (amps), A
Q is the charge in coulombs, C
t is the time in seconds, s
Direct Current (DC)
An electrical current can flow in either of two directions. If it flows in only one direction, it is called direct current.
 |
| Direct Current |
Alternating Current (AC)
A current which alternates in direction or polarity is called an alternating current.
 |
| Alternating Current |
Note: Direct current is represented by I and alternating current is represented by i.
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