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2 Circuits, generalities, & Signals

# 2 Circuits, generalities, & Signals - ECE 110 M-C...

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ECE 110 M.-C. Brunet Electrical Circuits (Generalities), and Signals Handout 2 Symbol: V Unit: Volts THE VOLTAGE: to create an orderly movement of electrons we need: closed circuit (i.e. connected components) a voltage source (“power supply”) A Voltage Source: the battery (Volta 1792) - h i - - + + + + + + + + - - - - - - - - There is no accumulation of charge anywhere in the circuit (wire) - - - Chemical energy (E) forces movement f electrons There is a strong relationship between the current through and the voltage across any M.-C. BRUNET ECE 110 UIUC 2.1 Potential: V=E/Q of electrons component in a circuit. I = f(V) (see later topics)

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ECE 110 M.-C. Brunet Electrical Circuits (Generalities), and Signals Handout 2 A Circuit: TERMINOLOGY component wire A Node: Any point on a wire ( A ) EL4 Set of components connected by wires A Terminals: Wires connecting an element (nodes A and B are the two terminals for the component EL4 ) B V A = potential at A with respect to the ground Ground = any node in the circuit arbitrarily hosen as a ference ode Voltage: voltage at Node A ( ) chosen as a reference node. [V(Ground)=0 is taken] Voltage difference of quantities = Symbol for Ground: (also: , ) M.-C. BRUNET ECE 110 UIUC 2.2 OTATION: oltage cross lement POLARITY OF VOLTAGE NOTATION: Voltage across element + - V polarity element A B The polarity of the voltage does not imply ny particular r the voltage. It states The numerical value V in the circuit above is VAB: any particular sign for the voltage. It states which difference of quantities to measure, or compute.
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2 Circuits, generalities, & Signals - ECE 110 M-C...

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