Electronics and Communication Engineering (ECE) Exam > Electronics and Communication Engineering (ECE) Notes > Chapter - DC Circuits, PPT, DC Circuit, Semester, Engineering
Chapter - DC Circuits, PPT, DC Circuit, Semester, Engineering - Electronics and Communication Engineering (ECE) PDF Download
Introduction
The slides cover the following topics:
- DC Circuits
- Equivalent Resistance
- Resistance in Parallel
- Kirchoff's Rules
- RC Circuit
DC Circuits----------------------------------------------------------------Next slide
DC Circuits
The circuit
Resistance in combinations
Kirchhoff’s Rules
RC transient circuits
DC Circuits----------------------------------------------------------------Next slide
Work done by a battery on charge
Here
DC Circuits----------------------------------------------------------------Next slide
Real Battery and Single Loop circuits… What’s the current ?
Conservation of energy: Kirchoff’s first Law: Sum of voltages in a closed loop is zero.
DC Circuits----------------------------------------------------------------Next slide
Equivalent Resistance Resistors in Series
Series requirements
–Conservation of energy
–Potential differences add
–Current is constant
Apply Ohm’s Law to each resistor
DC Circuits----------------------------------------------------------------Next slide
Resistors in parallel
Parallel requirements
–Charge conservation
–Currents must add
–Potential difference is same across each resistor
Apply Ohm’s Law to each resistor
DC Circuits----------------------------------------------------------------Next slide
Example 1
What is current through battery?
What is current through i2?
DC Circuits----------------------------------------------------------------Next slide
Kirchhoff’s Rules
1The algebraic sum of the currents entering a junction is zero. (Conservation of Charge)
2The algebraic sum of the changes in electric potential difference around any closed circuit loop is zero. (Conservation of Energy)
Signs for Rule 2
The direction of travel when traversing the loop is from a to b.
DC Circuits----------------------------------------------------------------Next slide
Problem 2
Find the currents in each of the three legs of the circuit,
Three unknowns, need three equations. Also since batteries are in there cannot reduce the resistances since none in parallel or series
DC Circuits----------------------------------------------------------------Next slide
Example: Applying Kirchhoff’s Rules
DC Circuits----------------------------------------------------------------Next slide
Another, example: applying Kirchhoff’s Rules
Solve the equations simultaneously for the values if I. If I is negative the current is in the opposite direction
DC Circuits----------------------------------------------------------------Next slide
RC Circuits and Time dependence
Time dependence
Recall Lab 7! Resistor slows down the charging
of the capacitor
Time dependent behavior (transient) 2 cases: switch at
“a” or at “b”
a)Charging
b)discharging
DC Circuits----------------------------------------------------------------Next slide
In position “a” Charging the Capacitor
DC Circuits----------------------------------------------------------------Next slide
What’s VR across resistor?
Find the current and multiply by R
Find the current and multiply by R
DC Circuits----------------------------------------------------------------Next slide
Discharging Position b:
DC Circuits----------------------------------------------------------------Next slide
Example: RC circuit
R=10W
C=1F
How long does it take the capacitor to reach ½ its final charge, if the capacitor is uncharged at t = 0?
DC Circuits----------------------------------------------------------------Next slide
1. Charging the Capacitor
Note : τ = RC
is called the time constant
What are the units?
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FAQs on Chapter - DC Circuits, PPT, DC Circuit, Semester, Engineering - Electronics and Communication Engineering (ECE)
| 1. What is a DC circuit? |  |
Ans. A DC circuit refers to a circuit that is powered by a direct current (DC) source. In a DC circuit, the flow of electric charge is unidirectional, meaning it flows in one direction only.
| 2. What is the significance of studying DC circuits in Engineering Electronics and Communication Engineering (ECE)? | |
Ans. DC circuits play a fundamental role in Electronics and Communication Engineering as they form the building blocks for various electronic devices and systems. Understanding DC circuits helps engineers design and analyze electronic circuits, which are essential for communication systems, power supplies, and other electronic devices.
| 3. What are some common components found in DC circuits? | |
Ans. Some common components found in DC circuits include resistors, capacitors, inductors, diodes, transistors, and batteries. These components are used to control the flow of current, store energy, and perform various functions within the circuit.
| 4. How do you calculate the total resistance in a DC circuit with multiple resistors? | |
Ans. To calculate the total resistance in a DC circuit with multiple resistors connected in series, simply add up the resistance values of each resistor. For resistors connected in parallel, the reciprocal of the total resistance is equal to the sum of the reciprocals of the individual resistances.
| 5. What is the difference between a series and parallel DC circuit? | |
Ans. In a series DC circuit, the components are connected end-to-end, forming a single path for the flow of current. The total resistance in a series circuit is the sum of individual resistances. In a parallel DC circuit, the components are connected across each other, providing multiple paths for the current to flow. The total resistance in a parallel circuit is calculated differently than in a series circuit and is generally lower than the individual resistances.
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