What is electromagnetic induction? Who invented the induction coil?
Electromagnetic induction is the process by which a changing magnetic field induces an electromotive force (emf) in a conductor - Leaving Cert Physics - Question 10 - 2009
Question 10
What is electromagnetic induction? Who invented the induction coil?
Electromagnetic induction is the process by which a changing magnetic field induces an elect... show full transcript
Worked Solution & Example Answer:What is electromagnetic induction? Who invented the induction coil?
Electromagnetic induction is the process by which a changing magnetic field induces an electromotive force (emf) in a conductor - Leaving Cert Physics - Question 10 - 2009
Step 1
What is electromagnetic induction? Who invented the induction coil?
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Answer
Electromagnetic induction is the process by which a changing magnetic field induces an electromotive force (emf) in a conductor. This is a fundamental principle of electromagnetism. The concept was discovered by Michael Faraday in 1831, who is often credited with the invention of the induction coil.
Step 2
What is the function of an induction coil?
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Answer
The primary function of an induction coil is to convert low-voltage direct current (DC) to high-voltage direct current. This is accomplished through electromagnetic induction, where a primary coil generates a magnetic field that induces a voltage in the secondary coil.
Step 3
Why is there a large number of turns in the secondary coil?
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Answer
The large number of turns in the secondary coil increases the induced emf. The induced emf is proportional to the rate of change of magnetic flux and the number of turns.
Step 4
Explain why the primary coil has thick wire.
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The primary coil has thick wire to ensure it has low resistance, which allows for greater efficiency and a larger current flow, thus reducing heating and energy losses.
Step 5
Why are both coils wrapped on the same soft-iron core?
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Both coils are wrapped on the same soft-iron core to achieve greater flux linkage and efficiency, minimizing energy losses and enhancing performance.
Step 6
List two other types of electromagnetic waves with energy less than that of light waves.
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Microwaves
Infrared
Step 7
Give one property that is common to all types of electromagnetic waves.
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Answer
A common property of all electromagnetic waves is that they travel at the same speed in a vacuum, approximately 3 x 10^8 meters per second. They can also be polarized, reflected, or diffracted.
Step 8
Describe, with the aid of a labelled diagram, how a loudspeaker operates.
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Answer
A loudspeaker operates through the interaction of a coil in a magnetic field, which results in a force that causes the coil to move and produce sound vibrations. The loudspeaker consists of a cone attached to the coil; the changing current flowing through the coil influences the magnetic field, creating motion and sound waves.
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