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ECE 1270 Introduction to Electric Circuits Suketu Naik
0ECE 1270: Introduction to Electric Circuits
Lecture 4:
Equivalent
Networks
Chapter 3
Simple Resistive
Circuits
ECE 1270 Introduction to Electric Circuits Suketu Naik
1Resistors in Series
Req=equivalent
resistance
ECE 1270 Introduction to Electric Circuits Suketu Naik
2Resistors in Series
Req=equivalent resistance
4321 RRRRReq
ECE 1270 Introduction to Electric Circuits Suketu Naik
3Resistors in Parallel
Req=equivalent resistance
4321
11111
RRRRReq
ECE 1270 Introduction to Electric Circuits Suketu Naik
4Example 3.1: Find is, i1, i2
ECE 1270 Introduction to Electric Circuits Suketu Naik
5AP 3.1
(a) Find the voltage v
(b) power delivered the to the circuit the current source
(c) power disspated in the 10 Ω resistor
ECE 1270 Introduction to Electric Circuits Suketu Naik
6Voltage Divider Circuit
ECE 1270 Introduction to Electric Circuits Suketu Naik
7Voltage Divider Examples
ECE 1270 Introduction to Electric Circuits Suketu Naik
8Current Divider Circuit
ECE 1270 Introduction to Electric Circuits Suketu Naik
9Current Divider Examples
Example 3.3: Find power dissipated in 6 Ω resistor
AP 3.3: Find R such that 4 A will flow through 80 Ω resistor
ECE 1270 Introduction to Electric Circuits Suketu Naik
10How do you measure Current and Voltage in a circuit?
Use Ammeter to measure the current: connect it in series
Use Voltmeter to measure the voltage: connect it in parallel
ECE 1270 Introduction to Electric Circuits Suketu Naik
11Delta-to-Y (Pi-to-Tee) Equivalent Circuits
Delta or Pi Configuration
Y or Tee Configuration
ECE 1270 Introduction to Electric Circuits Suketu Naik
12Delta-to-Y Transformation
Example 3.7: Find power supplied by 40V source
Wheatstone Bridge
ECE 1270 Introduction to Electric Circuits Suketu Naik
13How do you measure Resistance?
When the bridge is balanced, ig=0 and i1=i3 and i2=ixThen, Rx/R3=R2/R1
If R2=R1 then Rx=R3
Wheatstone Bridge
ECE 1270 Introduction to Electric Circuits Suketu Naik
14Y-to-Delta Transformation
AP3.8: Use Y-to-Delta transformation to find v
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