# Tag Info

### Why exactly does maximum power transfer happen at 50 ohms (matched impedance)?

The power delivered to the load is from the Joule heating effect: $$P=\dfrac{\Big(\dfrac{R_L}{R_L + 50}G\,V_{IN}\Big)^{2}}{R_L}$$ So from differential calculus we know ...
• 1,194
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### Will this circuit work ? 100 Leds project

No, that's a really bad circuit. You have 100 LEDs, all in parallel. Bad idea. Since this is a assignment, I'm not going to give you a better circuit outright. However, consider that LEDs want to ...
• 311k
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### check if an unsigned binary number is divisible by 15

Do you know how to check for divisibility by 9 in base 10? Add all the digits using base 10 arithmetic. If the result has multiple digits, repeat the process. Stop when you have one digit. If the ...
• 159k

### Why exactly does maximum power transfer happen at 50 ohms (matched impedance)?

Intuitively: when you raise the load resistance, you are increasing its share of the voltage (and thus power) versus the other resistance; but you are decreasing the total current (and thus power). ...
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### Combining resistors in a simple network

The ground node has got you confused. How much current flows in the ground? Why treat R4 and R5 different to R1 R2 R3?
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### Trouble understanding when voltages get split

Just re-draw the schematic, slightly: simulate this circuit – Schematic created using CircuitLab (Note that your confusion about "Would the 9V be split between these two resistors?" completely ...
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### How can I calculate the current flowing through this diode?

but I'm just not good at solving diodes in parallel circuits So, in general for problems like this (which you do hit in real life if you're doing circuit design, so it's not just academic), you start ...
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### Problem with equivalent resistance

simulate this circuit – Schematic created using CircuitLab Here's the circuit redrawn. R1 and R2 form a voltage divider, as do R3 and R4. Since the ratios are the same for each voltage divider,...
• 15.1k
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### How to calculate current at one circuit node in a textbook exercise

Maybe a little visual drawing will help. You can easily calculate the currents in each resistor using Ohms Law. Then using Kirchhoff's current law, all the currents in a node must sum to 0. Note: The ...
• 7,333
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### Inverting op-amp problem

Your simulation won't work unless you connect the op-amp's power supply voltage sources to ground on the other side! Also, the source of negative supply will need to be non-zero. Besides that, another ...
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### Design a 8 - 6 - 4 - 2 - 0 - 1 - 3 - 5 - 7 - 9... Counter

Given it is an assignment, I'm not going to work through the logic. However in all such questions you can boil it down to a circuit with two steps: You have a binary ...
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### Calculate total harmonic distortion

The amplitude distortion plot you showed is in dB, dBV specifically (dB's relative to 1 V). So you need to take those dB values and covert them into volts before putting them into your formula. For ...
• 9,737
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### how to solve this op-amp circuit?

Your circuit doesn't have negative feedback: - Therefore it acts as a comparator with hysteresis and hence, the output changes state when the input voltage passes the hysteresis threshold points ...
• 437k
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### Circuit analysis homework - LTspice results are different from calculations

Check your complex arithmetic:- @100Hz I get Za = 4.7000e+03 + 6.2832e+01i Zb = 2.2000e+03 - 3.3863e+04i Zc = 1.0000e+03 - 1.5915e+05i Zp = Za || Zb = 4.5887e+03 - 5.6789e+02i Vo = 4 * Zp/(Zp + Zc) = ...
• 379k
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### Input and Output Impedance parameters of two port network

For the input impedance, expand the matrix equation and then use the output condition: $Z_L=-\large \frac{V_2}{I_2}$ Similar approach for the output impedance.
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