Circuit Lab B

[StuffyNose45]

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

[BasuSiddha23]

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

[StuffyNose45]

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?

[Crimesolver]

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

[StuffyNose45]

You're correct. Your turn!

[Crimesolver]

What is the difference between an avalanche diode and a zener diode?

[azboy1910]

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.

[Crimesolver]

yep you are right

[azboy1910]

Ok,

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

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


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

[Creationist127]

Ok,

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

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


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

Click to Show Answer

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