- #1
KTiaam
- 53
- 1
Homework Statement
Need help on part a.
and c.
The Attempt at a Solution
- Part A
Im just confused how to find I1.
Also I am not sure how to find Vc.
- Part C
Any help is appreciated!
Well, yes, but you'll have to argue that based on the characteristics of an opamp with negative feedback. If you think in terms of the two golden rules of ideal opamp analysis..KTiaam said:Since Va = 4V then pin 2 and 3 also have 4v. Would that mean that Vin is = 4v as well?
You know what the voltage is across R1. What about Ohm's law?KTiaam said:Im just confused how to find I1.
Consider again the behavior of an ideal opamp with the feedback shown. It desperately wants to turn on that BJT hard, so it can reduce the voltage across its terminals to zero, but that really only requires the BJT to just barely move out of its cutoff region. You usually assume something about VBE then.KTiaam said:As for part c, I am having trouble with it entirely.
milesyoung said:You know what the voltage is across R1. What about Ohm's law?
The voltage (with respect to ground) at Vb is 6 V, and you drop down to 4 V as you cross the resistor to Va.KTiaam said:The thing that threw me off, is what voltage to use with r1,
But based off of the orientation of the current source, I use Vb?
so that means the voltage drop across the resistor is 2v, then using V=IRmilesyoung said:The voltage (with respect to ground) at Vb is 6 V, and you drop down to 4 V as you cross the resistor to Va.
Does that help?
Yes.KTiaam said:so that means the voltage drop across the resistor is 2v, then using V=IR
i get 2mA?
Nodal analysis is useful when you need to solve for unknown node voltages, but you're already given the node voltages on either side of the resistor, so all there's left to do is just apply Ohm's law.KTiaam said:or do i use Nodal Analysis?
milesyoung said:Yes.
Since Vb is at a higher potential than Va, what does that tell you about the direction of the current?
Circuit analysis is a branch of electrical engineering that deals with the study and analysis of electrical circuits. It involves using mathematical and engineering principles to understand and predict the behavior of electric circuits.
A circuit typically consists of three main components: a power source, such as a battery, a load, such as a light bulb or motor, and connecting wires. Other components, such as resistors, capacitors, and inductors, may also be present depending on the circuit's function.
Kirchhoff's Circuit Laws are fundamental principles used in circuit analysis. They include Kirchhoff's Current Law, which states that the sum of currents entering a junction in a circuit must equal the sum of currents leaving the junction, and Kirchhoff's Voltage Law, which states that the sum of voltage drops around a closed loop in a circuit must equal the sum of voltage sources.
AC (alternating current) circuits use an alternating voltage source, while DC (direct current) circuits use a constant voltage source. AC circuits are used for power distribution, while DC circuits are commonly used in electronic devices. Additionally, AC circuits involve the use of inductors and capacitors, while DC circuits typically do not.
To solve circuit analysis problems, you will need to apply the principles of Kirchhoff's Circuit Laws and use various techniques, such as Ohm's Law, to calculate the values of current, voltage, and resistance in a circuit. It is also helpful to draw a circuit diagram and use algebraic equations to solve for unknown values.