Circuit Lab B

Test your knowledge of various Science Olympiad events.
StuffyNose45
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Re: Circuit Lab B

Post by StuffyNose45 » November 17th, 2019, 11:35 am

1) Lenz's Law
2) Input resistance is infinite
3) R=p*L/A; Resistance= resistivity*length of wire/cross sectional area
4) Eddy Currents are loops of electrical current induced within conductors by a changing magnetic field in the conductor according to Faraday's law of induction

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Re: Circuit Lab B

Post by BasuSiddha23 » November 20th, 2019, 12:40 pm

StuffyNose45 wrote:
November 17th, 2019, 11:35 am
1) Lenz's Law
2) Input resistance is infinite
3) R=p*L/A; Resistance= resistivity*length of wire/cross sectional area
4) Eddy Currents are loops of electrical current induced within conductors by a changing magnetic field in the conductor according to Faraday's law of induction
Correct. Your turn to ask a question
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Re: Circuit Lab B

Post by StuffyNose45 » November 30th, 2019, 10:33 am

1. Which scientist coined the term solenoid?

2. How do you calculate the magnetic field of a solenoid given the magnetic constant, the current, length of the solenoid and the number of turns?

3. What are two ways to increase the magnetic field of a solenoid?

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Re: Circuit Lab B

Post by Crimesolver » January 8th, 2020, 11:51 am

StuffyNose45 wrote:
November 30th, 2019, 10:33 am
1. Which scientist coined the term solenoid?

2. How do you calculate the magnetic field of a solenoid given the magnetic constant, the current, length of the solenoid and the number of turns?

3. What are two ways to increase the magnetic field of a solenoid?
solenoid was coined by ampere
B = (magnetic constant*current*number of turns)/length
create more turns, add more current
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Re: Circuit Lab B

Post by StuffyNose45 » January 12th, 2020, 6:41 pm

You're correct. Your turn! :)

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Re: Circuit Lab B

Post by Crimesolver » January 22nd, 2020, 1:11 pm

What is the difference between an avalanche diode and a zener diode?
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Re: Circuit Lab B

Post by azboy1910 » February 17th, 2020, 1:00 pm

I know if this is really a difference or not, but,

An avalanche diode is designed to experience avalanche breakdown at a specified reversed bias voltage. Zener diodes are are designed to breakdown at a precisely set voltage.
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Re: Circuit Lab B

Post by Crimesolver » March 1st, 2020, 9:14 pm

yep you are right
Keep on going :)

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Re: Circuit Lab B

Post by azboy1910 » March 4th, 2020, 1:15 pm

Ok,

1) How does the polarity of an LED affect it?

2) In one hour, what is the work done by this circuit?
Image

3) Which wire has a greater resistance:
- Wire 1: Length of 2L, Cross-Sectional Area of 2A
- Wire 2: Length of 4L, Cross-Sectional Area of 3A
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Re: Circuit Lab B

Post by Creationist127 » March 4th, 2020, 1:58 pm

azboy1910 wrote:
March 4th, 2020, 1:15 pm
Ok,

1) How does the polarity of an LED affect it?

2) In one hour, what is the work done by this circuit?
Image

3) Which wire has a greater resistance:
- Wire 1: Length of 2L, Cross-Sectional Area of 2A
- Wire 2: Length of 4L, Cross-Sectional Area of 3A
1) An LED only allows current in one direction, so if it is in backwards (polarity reversed), it won't light up.
2) Total resistance = 15 Ω; P = IV = V²/R; P = 60²/15 = 240 W; P = W/t; 240 = W/3600; W = 864000 J = 860 kJ
3) R=ρL/A; R1 = ρ*2L/2A; R2 = ρ*4L/3A; R2 = R1*4/3, so R2 has the greater resistance
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