Physics-18 Electromagnetic induction prequiz

This is emf due to a relative motion between a magnet and a conductor in a circuit:

• induced emf

• electromagnetic induction

• Fleming's right hand rule

• AC generator

• slip rings

Answer explanation

Induced EMF - It can be defined as the generation of a potential difference in a coil due to the changes in the magnetic flux through it. In simpler words, electromotive force or EMF is said to be induced when the flux linking with a conductor or coil changes.

Tags

NGSS.HS-PS2-5

_____ is the process of creating a current in a circuit by changing a magnetic field

• induced emf

• electromagnetic induction

• Fleming's right hand rule

• AC generator

• slip rings

Answer explanation

Electromagnetic or magnetic induction is the production of an electromotive force (emf) across an electrical conductor in a changing magnetic field.

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NGSS.HS-PS2-5

_______ is - the thumb of the right hand corresponds to the direction of current - curve and rotate other fingers to determine which way the field around it goes

• induced emf

• electromagnetic induction

• Fleming's right hand rule

• AC generator

• slip rings

Answer explanation

Fleming's right hand rule is used to determine the direction of induced current in a coil. If the thumb (direction of motion), index finger (along magnetic field) and middle finger are held mutually perpendicular as shown in the figure, then middle finger gives the direction of induced emf in the wire.

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NGSS.HS-PS2-5

_____ is a coil of wire is rotated in a magnetic field. As the coil cuts through the magnetic field, the relative motion causes a current to be generated in the coil.

• induced emf

• electromagnetic induction

• Fleming's right hand rule

• AC generator

• slip rings

Answer explanation

An AC generator is a machine that converts mechanical energy into electrical energy, generated as an alternating current sinusoidal output waveform.

Tags

NGSS.HS-PS2-5

_____ are the parts of a generator that rotate with the armature and make contact with the brushes

• induced emf

• electromagnetic induction

• Fleming's right hand rule

• AC generator

• slip rings

Answer explanation

1. A slip ring is a ring in a dynamo or electric motor which is attached to and rotates with the shaft, passing an electric current to a circuit via a fixed brush pressing against it.

______ states the direction of an induced current is such that it'll oppose the change causing it.

• Lenz's Law

• power lines

• transformer

• primary coil

• secondary coil

Answer explanation

1. Lenz's law is a law stating that the direction of an induced current is always such as to oppose the change in the circuit or the magnetic field that produces it.

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

_____ are cables used to carry electricity from power stations to consumers

• Lenz's Law

• power lines

• transformer

• primary coil

• secondary coil

Answer explanation

1. Power lines is a cable carrying electrical power, especially one supported by pylons or poles.

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

A ____ is a device that increases or decreases the voltage of alternating current

• Lenz's Law

• power lines

• transformer

• primary coil

• secondary coil

Answer explanation

A transformer is an apparatus for reducing or increasing the voltage of an alternating current.

Tags

NGSS.HS-PS3-5

NGSS.HS-PS3-3

_______ is the coil in a transformer to which the electricity supply is connected.

• Lenz's Law

• power lines

• transformer

• primary coil

• secondary coil

Answer explanation

Definitions of primary coil. coil forming the part of an electrical circuit such that changing current in it induces a current in a neighboring circuit. synonyms: primary, primary winding.

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NGSS.HS-PS2-5

The _____ is the coil in a transformer where the changed voltage is obtained.

• Lenz's Law

• power lines

• transformer

• primary coil

• secondary coil

Answer explanation

Definitions of secondary coil. coil such that current is induced in it by passing a current through the primary coil. synonyms: secondary, secondary winding. type of: coil. reactor consisting of a spiral of insulated wire that introduces inductance into a circuit.

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5