Understanding Node Voltages and Component Polarities
Learn how to find node voltages and determine component polarities in electrical circuits. Follow step-by-step processes and visual aids to understand the concepts effectively.
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Presentation Transcript
EE-251 lab 2 Fall 2017
How do we find the node voltages ? Ground = 0 volts
Show current direction for each component I Direction of current flow
Show polarities on each component - + I Direction of current flow
Show polarities on each component - + I + - - + Direction of current flow
Process - To find VA Voltage at A referenced to ground - + I + - VA = V8.5v - V500 - + Ground = 0 volts I = 8.5v/(100+250+500) = 8.5v/850 = .01 A = 10 ma VA = V8.5v - V500 = 8.5v - (I*500) = 8.5 (.01*500) = 3.5 volts
Process - To find VA Voltage at A referenced to ground OR taking a different path - + I + VA = V100 + V250 - - + Ground = 0 volts I = 8.5v/(100+250+500) = 8.5v/850 = .01 A = 10 ma VA = V100 + V250 = (.01*100) +(.01*250) = 3.5 volts
