ECE201Lect-1

# ECE201Lect-1 - Introduction Units(1.1 Basic Quantities(1.2...

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ECE201 Lect-1 1 Introduction; Units (1.1); Basic Quantities (1.2); Circuit Elements (1.3) Dr. Holbert

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ECE201 Lect-1 2 Basic Electrical Quantities Basic quantities: current, voltage and power Current : time rate of change of electric charge I = dq / dt 1 Amp = 1 Coulomb/sec Voltage : electromotive force or potential, V 1 Volt = 1 Joule/Coulomb = 1 N·m/coulomb Power : P = I V 1 Watt = 1 Volt·Amp = 1 Joule/sec
ECE201 Lect-1 3 Current, I Normally we talk about the movement of positive charges although we know that, in general, in metallic conductors current results from electron motion (conventionally positive flow) The sign of the current indicates the direction of flow Types of current: direct current (dc): batteries and some special generators alternating current (ac): household current which varies with time

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ECE201 Lect-1 4 Voltage, V Voltage is the difference in energy level of a unit charge located at each of two points in a circuit, and therefore, represents the energy required to move the unit charge from one point to the other
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ECE201Lect-1 - Introduction Units(1.1 Basic Quantities(1.2...

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