3 Power and Energy

3 Power and Energy - ECE 110 M.-C. Brunet Analysis of...

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ECE 110 M.-C. Brunet Power & Energy Handout 3 Analysis of electrical circuits Find voltage across and current through all the components in a circuit. Standard Reference System (SRS) (so that we know which polarity/direction we are talking about) element AB SRS : conventional reference for the pair (polarity of V, direction of I) M.-C. BRUNET ECE 110 UIUC 3.1
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ECE 110 M.-C. Brunet Power & Energy Handout 3 Example 1: ) Are the following pairs (V I) in the SRS? E 1 + 5v - (a) Are the following pairs (V, I) in the SRS? 3A + -6v - E 2 8A E 3 - 8v + -5A M.-C. BRUNET ECE 110 UIUC 3.2 Remarks: Example 1: (cont’d) (b) Check whether the pairs (Voltage, Current) for the battery and for the resistor are in the SRS? I 7V resistor + - V1 battery + - For the battery: YES NO For the resistor: YES NO M.-C. BRUNET ECE 110 UIUC 3.3
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ECE 110 M.-C. Brunet Power & Energy Handout 3 Source : Component that generates energy (a voltage source is also called a power supply). Component that dissipates energy (e.g. in form of heat). Load : Is a given component a . . Load ? Source ? One way is to compute the power of the component. Symbol: P Unit: W (Watts) Power M.-C. BRUNET ECE 110 UIUC 3.4 P = V x I By definition Power computed in the SRS +V AB - Element AB I A B r P SRS =
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3 Power and Energy - ECE 110 M.-C. Brunet Analysis of...

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