What Is Current?

Posted by Jeff on Jul 23, 2009 in Basic Electrical Engineering Concepts |
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Let’s start with charge.  Charge is measured in coulombs, 1 coulomb has 6.24 x 10^{18} electrons.

Charge of 1 electron:  Qe = -1.6 x 10^{-19} coulomb.

Charge is carried by negative electrons and/or positive protons.  In a solid, the current is carried by electrons.

Current: is the rate of charge flow.

Current (I) = \frac{Charge}{Time} OR I =\frac{Q}{T}

1 Ampere = \frac{1 coulomb}{1 second}

1 A = \frac{1C}{1 S}

Amp = \frac{C}{ S}

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