ECE 231 -3

ECE 231 -3 - ECE-231 Section 101 Circuits and Systems I...

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Unformatted text preview: ECE-231 Section 101 Circuits and Systems I Fall 10 Session 3 Professor Stewart Personick Office: ECEC Room 321 Stewart.Personick@NJIT.edu Problem #2 +- 800 Volts A standard NJIT graduate student has a resistance (left hand-to-right hand) of 10,000 Ohms. I1 = 0.04A The power flowing out of the power source is: 800V x 0.04A = 32 Watts i1 32 Watts Problem #2 +- 800 Volts A standard NJIT graduate student has a resistance (left hand-to-right hand) of 10,000 Ohms. I1 = 0.04A The power flowing out of the power source is: 800V x 0.04A = 32 Watts 32 Watts 0Watts 16Watts i1 i1 i1 i1 Problem #2 +- 800 Volts A standard NJIT graduate student has a resistance (left hand-to-right hand) of 10,000 Ohms. I1 = 0.04A The power flowing out of the power source is: 800V x 0.04A = 32 Watts The power flowing into is: 400V x 0.04A = 16W The power flowing into is: 400V x 0.04A = 16W i1 16 Watts 32 Watts 16 Watts 0 Watts 16 Watts a b c Vab = 400V Vbc = 400V Problem #2 +- 800 Volts There is an electric field, having intensity: E (Volts per meter), between the wires There is a magnetic field, having intensity: H (Ampere-turns/meter), around each wire The power (Watts) is being carried by an electromagnetic wave, moving to the right, at the speed of light: 300,000,000 meters per second 32 Watts 0Watts 16Watts i1 i1 i1 i1 Electric field: E Magnetic field: H Delta-to-Wye Conversion Reference: p71-73 of the course textbook. See Example 3.7 for an application R 3 R 2 R 1 a b c R c R a R b a b c Ra= [ R1R2 + R2R3 + R3R1 ]/ R1 Rb= [ R1R2 + R2R3 + R3R1 ]/ R2 Rc= [ R1R2 + R2R3 + R3R1 ]/ R3 Delta-to-Wye Conversion a b c Rc R a R b R e R d d R d R e a b R3 R 2 R 1 c d Measuring the Series Resistance of a Voltage Source with an Ammeter +- 1.3 Volts Node b Node c 0-25 mA DC Meter M Meter coil resistance = 7 Ohms Y Ohms Step 1: Lets assume that we know what the open circuit voltage of the voltage source is. The open circuit voltage =vcb = 1.3V. We wish to determine Y Real voltage source +- * An ideal ammeter has 0 Ohms of series resistance . The ammeter measures the current flowing through the meter from the + terminal to Real Ammeter* Measuring the Series Resistance of a Voltage Source with an Ammeter +- 1.3 Volts i1 Node a Node b Node c 0-25 mA DC Meter M Meter coil resistance = 7 Ohms Y Ohms Z Ohms Step 2: Determine the required series resistance, Z Ohms, to...
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ECE 231 -3 - ECE-231 Section 101 Circuits and Systems I...

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