## Circuit Lab B/C

Test your knowledge of various Science Olympiad events.
azboy1910
Exalted Member
Posts: 115
Joined: November 3rd, 2018, 2:19 pm
Division: B
Pronouns: He/Him/His
Has thanked: 93 times
Been thanked: 38 times
Contact:

### Re: Circuit Lab B/C

ThomasL wrote:
December 5th, 2020, 6:34 pm
1. (assuming 2 sigfigs) 3.5e11 J/m^3
2. Overheats and burns up?
3. V3 = 10 V, V4 = 7.5 V

First circuit question marathon Hope that's right.
All good! Your turn!

ThomasL
Member
Posts: 15
Joined: March 5th, 2019, 2:14 pm
Division: C
State: VA
Has thanked: 0
Been thanked: 1 time

### Re: Circuit Lab B/C

Left this thread hanging for a while So here are some more questions:
1. Explain what a Zener diode is and how it's used.
2. How many NAND gates are required to make a NOT gate? A NOR gate? An XOR gate?
3. What is the peak-to-peak voltage of USA AC electricity?

azboy1910
Exalted Member
Posts: 115
Joined: November 3rd, 2018, 2:19 pm
Division: B
Pronouns: He/Him/His
Has thanked: 93 times
Been thanked: 38 times
Contact:

### Re: Circuit Lab B/C

ThomasL wrote:
January 29th, 2021, 10:26 am
Left this thread hanging for a while So here are some more questions:
1. Explain what a Zener diode is and how it's used.
2. How many NAND gates are required to make a NOT gate? A NOR gate? An XOR gate?
3. What is the peak-to-peak voltage of USA AC electricity?
1. A zener diode is a diode designed to operate and experience breakdown at a specific reverse voltage, when current starts flowing through the diode in reverse bias.
2. It takes 1 NAND gate to make a NOT gate, 4 NAND gates to make a NOR gate and 4 NAND gates to make a XOR gate.
3. The peak-to-peak voltage in US households is 340 V.
Last edited by azboy1910 on February 9th, 2021, 12:46 pm, edited 3 times in total.

ThomasL
Member
Posts: 15
Joined: March 5th, 2019, 2:14 pm
Division: C
State: VA
Has thanked: 0
Been thanked: 1 time

### Re: Circuit Lab B/C

azboy1910 wrote:
February 9th, 2021, 12:44 pm
ThomasL wrote:
January 29th, 2021, 10:26 am
Left this thread hanging for a while So here are some more questions:
1. Explain what a Zener diode is and how it's used.
2. How many NAND gates are required to make a NOT gate? A NOR gate? An XOR gate?
3. What is the peak-to-peak voltage of USA AC electricity?
1. A zener diode is a diode designed to operate and experience breakdown at a specific reverse voltage, when current starts flowing through the diode in reverse bias.
2. It takes 1 NAND gate to make a NOT gate, 4 NAND gates to make a NOR gate and 4 NAND gates to make a XOR gate.
3. The peak-to-peak voltage in US households is 340 V.
Looks good!! Your turn!

azboy1910
Exalted Member
Posts: 115
Joined: November 3rd, 2018, 2:19 pm
Division: B
Pronouns: He/Him/His
Has thanked: 93 times
Been thanked: 38 times
Contact:

### Re: Circuit Lab B/C

Ok, here are some easy ones since I can't think of any hard ones:

1) What direction do electric field lines created by a stationary proton point?
2) Do ferromagnetic metals retain their magnetic property? If not, state what needs to happen for its magnetic property to be "activated."
3) An ideal diode connected to a 5 V battery in reverse bias will receive how much current and how much voltage?
Last edited by azboy1910 on February 11th, 2021, 8:37 pm, edited 2 times in total.

UTF-8 U+6211 U+662F
Exalted Member
Posts: 1594
Joined: January 18th, 2015, 7:42 am
Division: C
State: PA
Has thanked: 6 times
Been thanked: 9 times

### Re: Circuit Lab B/C

azboy1910 wrote:
February 11th, 2021, 8:35 pm
Ok, here are some easy ones since I can't think of any hard ones:

1) What direction do electric field lines created by a stationary proton point?
2) Do ferromagnetic metals retain their magnetic property? If not, state what needs to happen for its magnetic property to be "activated."
3) An ideal diode connected to a 5 V battery in reverse bias will receive how much current and how much voltage?
These are pretty hard for easy questions haha
1) Radially outwards
2) Yes
3) 0, 0

azboy1910
Exalted Member
Posts: 115
Joined: November 3rd, 2018, 2:19 pm
Division: B
Pronouns: He/Him/His
Has thanked: 93 times
Been thanked: 38 times
Contact:

### Re: Circuit Lab B/C

UTF-8 U+6211 U+662F wrote:
February 22nd, 2021, 9:12 am
azboy1910 wrote:
February 11th, 2021, 8:35 pm
Ok, here are some easy ones since I can't think of any hard ones:

1) What direction do electric field lines created by a stationary proton point?
2) Do ferromagnetic metals retain their magnetic property? If not, state what needs to happen for its magnetic property to be "activated."
3) An ideal diode connected to a 5 V battery in reverse bias will receive how much current and how much voltage?
These are pretty hard for easy questions haha
1) Radially outwards
2) Yes
3) 0, 0
I could be wrong too obviously, but:
 1. Correct
2. Ferromagnetic metals do not retain their magnetic property. An external magnetic field must be applied to them in order for its magnetic properties to show.
3. An ideal diode acts as a resistor with infinite resistance in reverse bias. So yes, no current flows through the diode, but there is still 5 V across the diode. Instead of using 0 as the current, even though it is technically 0, I like to represent the current as (5/infinity) to better understand this. Multiply the current by the infinite resistance, and you get 5 V. 
Last edited by azboy1910 on February 22nd, 2021, 9:31 am, edited 3 times in total.

UTF-8 U+6211 U+662F
Exalted Member
Posts: 1594
Joined: January 18th, 2015, 7:42 am
Division: C
State: PA
Has thanked: 6 times
Been thanked: 9 times

### Re: Circuit Lab B/C

azboy1910 wrote:
February 22nd, 2021, 9:28 am
UTF-8 U+6211 U+662F wrote:
February 22nd, 2021, 9:12 am
azboy1910 wrote:
February 11th, 2021, 8:35 pm
Ok, here are some easy ones since I can't think of any hard ones:

1) What direction do electric field lines created by a stationary proton point?
2) Do ferromagnetic metals retain their magnetic property? If not, state what needs to happen for its magnetic property to be "activated."
3) An ideal diode connected to a 5 V battery in reverse bias will receive how much current and how much voltage?
These are pretty hard for easy questions haha
1) Radially outwards
2) Yes
3) 0, 0
I could be wrong too obviously, but:
 1. Correct
2. Ferromagnetic metals do not retain their magnetic property. An external magnetic field must be applied to them in order for its magnetic properties to show.
3. An ideal diode acts as a resistor with infinite resistance in reverse bias. So yes, no current flows through the diode, but there is still 5 V across the diode. Instead of using 0 as the current, even though it is technically 0, I like to represent the current as (5/infinity) to better understand this. Multiply the current by the infinite resistance, and you get 5 V. 
I think ferromagnetic materials display permanent magnetism?
What's the drift speed in a copper wire that has an electron density of $8.5 \times 10^{28}\, \textrm{m}^{-3}$ and a diameter of 3 mm, with a current of 55 mA? Give your final answer to at least two significant figures.
Last edited by UTF-8 U+6211 U+662F on February 22nd, 2021, 9:36 am, edited 1 time in total.

azboy1910
Exalted Member
Posts: 115
Joined: November 3rd, 2018, 2:19 pm
Division: B
Pronouns: He/Him/His
Has thanked: 93 times
Been thanked: 38 times
Contact:

### Re: Circuit Lab B/C

UTF-8 U+6211 U+662F wrote:
February 22nd, 2021, 9:36 am
azboy1910 wrote:
February 22nd, 2021, 9:28 am
UTF-8 U+6211 U+662F wrote:
February 22nd, 2021, 9:12 am

These are pretty hard for easy questions haha
1) Radially outwards
2) Yes
3) 0, 0
I could be wrong too obviously, but:
 1. Correct
2. Ferromagnetic metals do not retain their magnetic property. An external magnetic field must be applied to them in order for its magnetic properties to show.
3. An ideal diode acts as a resistor with infinite resistance in reverse bias. So yes, no current flows through the diode, but there is still 5 V across the diode. Instead of using 0 as the current, even though it is technically 0, I like to represent the current as (5/infinity) to better understand this. Multiply the current by the infinite resistance, and you get 5 V. 
I think ferromagnetic materials display permanent magnetism?
Sorry yeah, after external magnetic field is applied it retains magnetism I believe, I should've been more specific in the question because I was referring to before an external magnetic field is applied.
What's the drift speed in a copper wire that has an electron density of $8.5 \times 10^{28} \frac{\textrm{electrons}}{\textrm{m}^{3}}$ and a diameter of 3 mm, with a current of 55 mA? Give your final answer to at least two significant figures.