Circuit Lab B/C

[Cathy-TJ]

Calculate the resistance between terminals A and B in the infinite chain of resistors where all resistors are 1 ohm.
https://drive.google.com/open?id=1SuAGn ... q1QjmSB_6H

Answer (Click to Show Hidden Text)

Since the network repeats, if its resistance is R, it consists of a 1-ohm resistor in series with a unit consisting of a parallel 1-ohm and R-ohm resistor. Solving for R, we see that [math]R=\frac{1+\sqrt5}2\Omega[/math], or assuming sufficient sig figs, about [math]1.618\Omega[/math].

Nice!

Fun Fact (Click to Show Hidden Text)

The answer is also the golden ratio!

[mjcox2000]

Positive and negative charge carriers behave the same in almost all circuits. However, there are some circuits in which it actually makes a difference whether charge carriers are positive or negative. What is an example of a circuit in which this matters, and why does the distinction matter for this circuit?

[Cathy-TJ]

Positive and negative charge carriers behave the same in almost all circuits. However, there are some circuits in which it actually makes a difference whether charge carriers are positive or negative. What is an example of a circuit in which this matters, and why does the distinction matter for this circuit?

A guess (Click to Show Hidden Text)

N-gate and P-gate transistors? P gates allow flow when the signal is low (logic 0), while N-gates allow flow when the signal is high (logic 1).
Might be misinterpreting this question.

[mjcox2000]

Positive and negative charge carriers behave the same in almost all circuits. However, there are some circuits in which it actually makes a difference whether charge carriers are positive or negative. What is an example of a circuit in which this matters, and why does the distinction matter for this circuit?

A guess (Click to Show Hidden Text)

N-gate and P-gate transistors? P gates allow flow when the signal is low (logic 0), while N-gates allow flow when the signal is high (logic 1).
Might be misinterpreting this question.

That’s not what I was going for.

Let me try rephrasing the question: Describe a circuit in which macro-level measurements of the circuit would differ depending on whether charge carriers are electrons flowing opposite conventional current or positive charge carriers flowing in the direction of conventional current.

[Cathy-TJ]

Positive and negative charge carriers behave the same in almost all circuits. However, there are some circuits in which it actually makes a difference whether charge carriers are positive or negative. What is an example of a circuit in which this matters, and why does the distinction matter for this circuit?

A guess (Click to Show Hidden Text)

N-gate and P-gate transistors? P gates allow flow when the signal is low (logic 0), while N-gates allow flow when the signal is high (logic 1).
Might be misinterpreting this question.

That’s not what I was going for.

Let me try rephrasing the question: Describe a circuit in which macro-level measurements of the circuit would differ depending on whether charge carriers are electrons flowing opposite conventional current or positive charge carriers flowing in the direction of conventional current.

Answer (Click to Show Hidden Text)

A circuit that uses Hall effect, since changing the charge carrier would reverse the voltage produced.

[mjcox2000]

A guess (Click to Show Hidden Text)

N-gate and P-gate transistors? P gates allow flow when the signal is low (logic 0), while N-gates allow flow when the signal is high (logic 1).
Might be misinterpreting this question.

That’s not what I was going for.

Let me try rephrasing the question: Describe a circuit in which macro-level measurements of the circuit would differ depending on whether charge carriers are electrons flowing opposite conventional current or positive charge carriers flowing in the direction of conventional current.

Answer (Click to Show Hidden Text)

A circuit that uses Hall effect, since changing the charge carrier would reverse the voltage produced.

Right! Your turn.

[Cathy-TJ]

When and why would you use a Kelvin Double Bridge?

[Things2do]

To measure unknown resistors under 1 Ohm?

[Cathy-TJ]

To measure unknown resistors under 1 Ohm?

That's right!

This is because (Click to Show Hidden Text)

the resistance of the wires becomes significant

You have the next question!

[mjcox2000]

Since no one has posted a question yet:

An LED with voltage drop and internal resistance is in series with a voltage and resistance . The LED’s maximum rated current is , and the minimum current at which its light is visible is .

1. What is the minimum series voltage for the LED to emit visible light?
2. Given the value of , write equations for the minimum and maximum value of for the LED to emit visible light without burning out.