electric circuits basics

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Contents

DC Circuits

Basic Concepts

Systems of Units

Charge and Current

Charge is an electrical property of the atomic particles of which matter consists, measured in coulombs (C).

1 coulomb = charge transferred by 1 ampere in 1 second or  1 C = 1 A * 1 s = 6.242×10^18 protons


Electric current is the time rate of change of charge, measured in amperes (A).

1 amp = 1 coulomb / sec

A direct current (dc) is a current that remains constant with time. An alternating current (ac) is a current that varies sinusoidally with time.


Power is the rate of doing work, the amount of energy transferred per unit time. Measured in watts


Energy is the capacity to do work, measured in joules (J).