Electricity from Magnetism
Random Circuitry
Lenz's Law
Vocabulary Review
Random Trivia
200
This is the process of creating current in a circuit by changing magnetic field.
What is electromagnetic induction?
200
A series of pickups designed to reduce hum of a guitar string?
What is a humbucker?
200
The direction of the Magnetic Flux
What is up?
200
Electromagnetic waves are generated by the changing of these two types of fields.
What are electric and magnetic fields?
200
What job did Dr. G have across Europe as a young chap?
Busker/Clown
300
These are the three ways current can be induced in a circuit.
What is 1) by moving it into or out of a magnetic field 2) by rotating it in the magnetic field 3) by changing the intensity or direction of the magnetic field?
300
What is the primary function of an inductor in an electrical circuit?
- a) To store electrical potential energy
- b) To resist changes in current
- c) To convert AC current to DC current
- d) To amplify electrical signals
B
300
Direction of the induced flux
What is right?
300
The transfer of energy associated with an electric and magnetic field.
What is electromagnetic radiation?
300
What is the name of traditional paper in Korea?
Hanji
400
According to Faraday's Law, Changing the magnetic flux of a closed loop causes this.
What is emf or voltage?
400
The type of currents in cookware on an induction stove?
What are Eddy Currents?
400
Direction of Induced Current in the loop
What is Counterclockwise?
400
BAcosθ
What is magnetic flux
400
How many DisneyLand Parks are there in the world?
5. Shanghai, Tokyo, Hong Kong, Paris, LA
Orland is Disney World, DisneySea is also in Tokyo.
500
A single circular loop with a radius of 25cm is placed in a uniform external field with strength of 0.75T so that the plane of the coil is perpendicular to the field. The coil is pulled steadily out of the field in 0.25s. Find the average induced emf during this interval.
What is 0.59V?
500
A step-down transformer has 525 turns in its secondary and 12,500 turns in its primary. If the potential difference across the primary is 3,510V, what is the potential difference across the secondary?
What is 147V?
500
Lenz's law states that the direction of the induced current in a coil is such that it...
What is Opposes the change in magnetic flux that produced it
500
An insulating material put inside a capacitor
What is a dielectric?
500
What month and Year was Mr. Horner born? Half points for month, half points for year.
He's an 80's baby! The most 80s. 1989, December.
600
A coil contains 250 loops and has a radius of 25cm and is placed in a uniform external field with strength of 0.75T so that the plane of the coil is perpendicular to the field. The coil is pulled steadily out of the field in 0.25s. Find the average induced emf during this interval.
What is 150V?
600
Why do we transfer electricity at very high voltages from power plants?
To avoid heat loss by reducing current which reduces resistance
600
A conducting ring encloses an area of 2.0 cm2 and is perpendicular to a magnetic field of strength 5.0 mT. The direction of the magnetic field is reversed in a time 4.0 s. What is the average emf induced in the ring?
A. 0
B. 0.25 μV
C. 0.40 μV
D. 0.50 μV
D 0.50 μV
600
States that the current is always opposed to the change producing it
What is Lenz's Law?
600
What is the national flower of South Korea?
mugunghwa (무궁화) (aka mokkeunhwa (목근화)), also known as the rose of Sharon.