7Electromagnetic_induction_DC_generator_and_an_electric_engine_presentation
Оценка 4.6

# 7Electromagnetic_induction_DC_generator_and_an_electric_engine_presentation

Оценка 4.6
ppt
07.05.2020
7Electromagnetic_induction_DC_generator_and_an_electric_engine_presentation.ppt

## Learning objectives -to explain the received results in a well-argued manner using

Learning objectives

-to explain the received results in a well-argued manner using Faraday's law of induction and Lentz's law.
-apply Faraday’s and Lentz’s law in action

## Electromagnetic Induction-Investigation

Electromagnetic Induction-Investigation

## Faraday’s Law of Induction A changing magnetic flux induces an

A changing magnetic flux induces an EMF

## Questions-Answers method Why current do induced in the circuit?

Why current do induced in the circuit?
How do you name this current?
How to determine the direction of induced current?
Why current is induces when only magnet is in action?

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## What is EMF? Looks like potential

What is EMF?

Looks like potential. It’s a “driving force” for current

## Faraday’s Law of Induction A changing magnetic flux induces an

A changing magnetic flux induces an EMF, a curling E field

## Magnetic Flux Thru Wire Loop Analogous to

Magnetic Flux Thru Wire Loop

Analogous to Electric Flux (Gauss’ Law)

(1) Uniform B

(2) Non-Uniform B

## Minus Sign? Lenz’s Law Induced

Minus Sign? Lenz’s Law

Induced EMF is in direction that opposes the change in flux that caused it

## Faraday’s Law of Induction Changing magnetic flux induces an

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Changing magnetic flux induces an EMF

Lenz: Induction opposes change

## Ways to Induce EMF Quantities which can vary with time:

Ways to Induce EMF

Quantities which can vary with time:

Magnitude of B
Area A enclosed by the loop
Angle q between B and loop normal

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Technology

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Metal Detector

## 14 Induction Stovetops

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Induction Stovetops

## Ground Fault Interrupters (GFI)

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Ground Fault Interrupters (GFI)

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Electric Guitar

Pickups

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Electric Guitar

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