ECE201_03_R_Ohm_Pwr_Dep_sources_before

# ECE201_03_R_Ohm_Pwr_Dep_sources_before - ECE 201 Lecture 3...

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1 ECE 201, Lecture 3 Resistance, Ohm’s Law, Power, Dependent Sources Please take advantage of the TA help room (EE 26). Please feel free to email me should you have questions. Office hours: Monday, 1:30pm-2:30pm and Friday 2:30pm – 4:30pm. Announcements

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2 Ideal voltage source: - + + - Circuit Circuit -v(t) v(t) Circuit Circuit i(t) -i(t) Ideal current source: Supplies voltage v(t) regardless of circuit currents Supplies current i(t) regardless of circuit voltages
3 Voltage is the difference between electric potentials Charges flow from high energy locations to low energy locations. We really want to show the electrical energy at different location of a circuit. But we don’t know the amount of charge at each location in general, so what we do? Define: It is the potential difference (or voltage across an element) that drives current. Can define ground (U=0) at any point of the circuit 1 2 12 W W W U and V q q - = =

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4 Definition of Voltages B V x + + - - A V y A B + - V AB V +- 5 2 V AB = – V BA , V 25 = – V 52 V 1 = V + – = – V – + V 1 V AB = – V BA , V x = V + – x = V AB V y = V + –y = V BA = – V BA Voltage DROP V AB is defined as V AB = V A – V B
5 One subscript: V A ,V B ,V 1 ,V 2 etc. Reference: ground or zero potential A B + - V AB G V AG =V A , V BG =V B , V AB =V AG -V BG =V A -V B Example 2: V A =10V, V B =5V V AB =?? Voltage or Potential at one node

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Power = Work / time Work = Energy differences = W 1 -W 2 Voltage is energy difference divided by charge V 12 = (W 1 -W 2 )/Q Q = I * t P = V
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ECE201_03_R_Ohm_Pwr_Dep_sources_before - ECE 201 Lecture 3...

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