Hi, so I've just started learning about physics and I get the gist of most of it. I understand motion, torque, energy, light, radioactivity. But there is one topic that absolutely stumps me. Electricity.
Can someone explain to an absolute moron like me what it is? It seems like everyone around...
1. Homework Statement
FIND i(t).
2. Homework Equations
VL = L*(di/dt) (Equation 1)
IC = C*(dV/dt) (Equation 2)
I(t) = e^-9*t*(A*cos(4.359*t) + B*sen(4.359*t)) A (Equation 3)
3. The Attempt at a Solution
I can get the exact value of the constant B as shown in the answer if I use -6...
hi,
so i want to be able to run a motor depending on whether or not an IR detector senses IR light. so the basic idea at the start was to connect the motor with the detector and a resistor in series and therefore if there is IR the current will flow turning on the motor. I then learned that the...
Hello everyone,
Imagine two points that have a Electric Potential Difference of 10V and they are connected through a conductor wire. Let's call these points A and B:
Now imagine we have a charge on A of 1C. To move the charge to B, we need to make a work of 10J, right?
So, now, imagine the...
Hi I got stuck at the following circuit problem which involves linear algebra, since I am not a physics major, I dont even have the basics to get started. Please shed some light, really appreciate it! Thanks a lot.
1. Homework Statement
Consider a long chain of resistors wired up like this...
This is a problem from Foundations of Analog and Digital Electronic Circuits by Agarwal & Lang, I'm going through it by myself, I'm not in a course, so I'm depending on you friendly forum people for help! I really like this book but it has a lot of errors, perhaps this is another error.
1...
1. Homework Statement
When an initially charged capacitor is connected in a circuit with an uncharged capacitor, why would the total energy of both capacitors be less than the initial energy of the charged capacitor?
2. Homework Equations
This was a question asking for an explanation, so I'm...
A d.c circuit consists of a switch, lamp and inductor.
The inductor is replaced with an inductor with twice the number of turns in the coil of wire, nothing else about it is changed.
State the effect on
A) maximum current
B) the time to reach max current
I thought increasing the turns would...
Hi guys,
Sorry if all you guys think this question is too easy. But I have a hard time to understand how to group the resistor. I suppose to find the the thevenin and Norton equivalent circuit. This is what i think about the combination of resistor.
Req1= RL+1k
Req2= Req1 ll 3.3k (3.3k after...
1. Homework Statement
2. Homework Equations
P = V^2 / R
1/Rt = sum(1/Ri) (parallel)
3. The Attempt at a Solution
Since all the answer choices express the solution in terms of V^2 / R, I tried to find the voltage drop across resistor #2 to find the power. I collapsed the two parallel...
1. Homework Statement
I hope you can see the picture clearly. Someone drew lines over it,so please try to ignore that.
The problem here is to determine the current of ideal current source Ig, if following parameters are known:
-E1=50V, E3=30V
-R1=200Ω, R2=500Ω, R3=3kΩ, R4= 10 kΩ
-C=0.7 μF...
1. Homework Statement
Find the potential difference between points b and a in the circuit below
I have already solved for the voltages of the two batteries (1 and 2) in the circuit (18 V and 7 V respectively)
2. Homework Equations
Kirchhoff's Rules
1) Potential difference across any closed...
1. Homework Statement
This problem apparently has a simple solution if you are good with circuit theorems but no matter what i try or how i combine them, it's just impossible. Given a circuit on the picture, and circuit parameters E3=12V,R1=1kΩ,R2=30Ω,R3=150Ω,R6=200Ω, if it is known that...
So, recently I started learning about electronic components and then I started learning about semiconductors. The one which I've been having some real trouble to understand its function is the transistor.
So I bought an electronics textbook called El ABC de La Electrónica (The ABC of Electronics...
Mentor note: Member warned about posting a question without the template
1. Find the electrical potential between A and B given that R1=R2=R4=100 Ohms; Power dissipated by R3 is 200 mW at 9 Volts
[ code ]
A---------R1-----------*-------------------
| |...
1. Homework Statement
So this is not really a 'solve this problem' question, but, rather, I am trying to understand how they can call ABCDEFA a 'closed loop' even though there is another connection (BE) inside it, and why the equations work.
Keeping in mind that I am still in high school...
1. Homework Statement
Find ##a)\ H(s)=\frac{V_o}{V_s}## of the filter in the circuit below.
##b)\ ##The center frequency ##\omega_0##
##c)\ ##The band-width B
Correct answers:
##a)\ H(s)=\frac{6s}{12s^2+11s+1}##
##b)\ \omega_0=0.28\frac{rad}{s}##
##c)\ B=0.71\frac{rad}{s}##...
1. Homework Statement
Find the transfer function ##H(s)=\frac{Vi(s)}{Ii(s)}##
The circuit consists of a voltage source and a 5H Inductor in series with a 10Ohm Resistor which are in parallel with a 10uF Capacitor in series with a 500Ohm Resistor. ##\rightarrow## Diagram here.
2. Homework...
1. Homework Statement
2. Homework Equations
3. The Attempt at a Solution
I did a source conversion on the right-most 1A current source to get a voltage source to work with for this question. However, when I tried to work out the solution, my values seem wrong, but I don't understand...
1. Homework Statement
2. Homework Equations
##v1 + v2 + v3 = 0## (KCL)
3. The Attempt at a Solution
I don't understand why my solution is wrong. I was taught that if I were to use Node Voltage analysis, I should put nodes with voltage sources into supernodes which was what I did...
Hey all,
This question may sound daft, but how do I normalize angular frequency? For a little background: I'm trying to optimize some circuits, and I've managed to write some successful code using the "Design of Ultra Wideband Antenna Matching Networks" book, but the code requires normalized...
1. Homework Statement
What do you predict the voltage will be measured from B to D directly?
Vtot = 1.0 V peak-peak
Two parallel branches, one with two 1.5 kOhm resistors in series, one with a 1.5 kOhm resistor and a 0.1 μF capacitor in series (see attached diagram)
2. Homework Equations...
1. Homework Statement
Look at the circuit given in figure 1. Solve for the three currents, I1,I2,I3.
2. Homework Equations
KVL: Sum of voltages in a closed loop equals zero
KCL: Sum of currents entering a junction equals the sum of currents exiting a junction
Ohm's Law: V=IR
NOTE: Nodal...
1. Homework Statement
Find the value of R where RL equals 50 Ω, for maximum power transfer
I= 2A, R_L=50 ohms
2. Homework Equations
R_th=V_oc/I_sc
KCL,KVL,V=IR
3. The Attempt at a Solution
First, I created an open circuit including everything except R_L. Then i tried to solve for the Open...