Discovery Faradays law: The induced electromotive force (EMF) in any - - PowerPoint PPT Presentation

Discovery



Faraday’s law: The induced electromotive force (EMF) in any closed circuit is equal to the time rate of change of the magnetic flux through the circuit.

 This applies whether the field itself changes in strength or the

conductor is moved through it.



Whereas it was already known at this time that an electric current produced a magnetic field, Faraday demonstrated that the reverse was also true.

 In short, he proved that one could generate an electric current by

passing a wire through a magnetic field.



To test this hypothesis, Faraday wrapped a piece of metal wire around a paper cylinder and then connected the coil to a galvanometer. He then moved a magnet back and forth inside the cylinder and recorded through the galvanometer that

 an electrical current was being induced in the wire.



He confirmed from this that a moving magnetic field was necessary to induce an electrical field, because

 when the magnet stopped moving, the current also ceased.

First Finger = Field Second Finger = Current Thumb = Motion

Invention

 Faraday disk, the first electric generator. The horseshoe-

shaped magnet (A) created a magnetic field through the disk (D). When the disk was turned this induced an electric current radially outward from the centre toward the rim. The current flowed out through the sliding spring contact m, through the external circuit, and back into the centre of the disk through the axle.

Discovery of Incandescence

• In 1802, English chemist Humphry Davy

demonstrated that by running electricity through a thin strip of metal

• that strip could be heated to temperatures high

enough so they would give off light

• The strip of metal, called a filament, is

resistant to the electricity flowing through it

• the thinner the metal, the higher the resistance
• The resistance turns the electrical energy

into heat, and when the filament becomes white-hot

• it gives off light

Invention

Innovation

Sources of Innovation

The Innovation Process

 Types of

Innovation

 Invention  Extension  Duplication  Synthesis

 Sources of Innovation

 Unexpected occurrences  Incongruities  Process needs  Industry and market changes  Demographic changes  Perceptual changes  Knowledge-based concepts

Sources of Innovation

Within the Industry

 The unexpected

Success, failure, outside event

 The incongruity

Discrepancy

between reality and what everyone assumes to be

Discrepancy between what is and what ought

to be

 Innovation based on process need

Weak link is evident in a particular process

but people work around it instead of doing something about it

 Changes in industry or market structure

Shift in the underlying foundation of the

Industry or market structure

Sources of Innovation (cont…)

In societal environment

 Demographics

Changes in population’s size, age, structure,

composition, employment, level of education and income, literacy, double income parents, increase in life expectancy

 Changes in perception, mood and meaning

Shift in society’s general assumptions, attitudes

and beliefs

 New Knowledge

Advances in scientific and non-scientific

knowledge

Big possibility when advances in two different

areas can be integrated to form a basis for a completely new product

Unexpected Occurrences

 3M scientists working on new adhesives  Basic requirement Strong bond  Instead the new adhesive had just enough

stickiness to attach and unpeel

 After several possible applications, 3M

came up with

Post-it notes  Became a blockbuster

One property : different applications

Incongruities

 Between economic realities

A steadily growing market but

falling profit margins

 Ocean freight carriers

Larger engines Faster speed

 Limited improvement in profit

margins

Sea Change in Ocean Transport

Malcolm McLean

 Packing a diverse set of goods  Loading large number of nonstandard

packages

 Actual sea transport between ports  Unloading the packages  Transporting by road/train to final

destination

 Ratio of Loading/Unloading to travel very

high

 Skewed bottlenecking

Process Needs

 Existing process has limitations  Speed  Yield  Quality  Energy consumption  Safety concerns

Meeting the Process Need

 Rectification of alcohol

95% alcohol and 5% water

 No further purification is possible  Innovation: add a third component

Benzene

 Formation of azeotropes

Alcohol + Benzene and Alcohol + Water

 100% alcohol

Industry and Market Structure

 Rapid growth

Production Marketing

 Convergence of technologies

ICT Mobile phones

 Deregulation

Airlines : Low cost carriers Telecom : Value-added services

Demographic Changes

 The most reliable source  Demographic events have known lead

times

 By 1970, all developed countries knew

Fall in birth rates Education explosion Huge increase beyond high school

 Non-availability of entry level workers  Japanese took lead and developed

Robotics

Changes in Perception

 Higher life expectancy

Better quality of life

 Huge demand in

Healthcare magazines Jogging equipment and apparel Health foods Indoor exercise equipment

 Young : Inside & Outside

Olive Oil Hair Dye

 Home Loans

New Knowledge

 Among history making innovations, those based

• n new knowledge rank very high

 Many emerge as superstars of entrepreneurship  Key characteristics

Long lead times High casualty rates Low predictability

 Multi-dimensional challenges to entrepreneurs  Although all the necessary knowledge was

available by 1918,

first operational computer appeared in 1946

 Knowledge based innovation is more market

dependent than any other kind of innovation

100 Years of Superconductivity

Superconductivity was first discovered on April 8, 1911, by the Dutch physicist Heike Kamerlingh Onnes. Over four decades, applications ranging from the electric power grid to consumer electronics to advanced military equipment have been developed

Genetic Engineering Products

Time from Invention to Production

Year of Invention

Technology Time Lag

1852 Fluorescence 82 years 1887 Radar 46 years 1891 Zipper 34 years 1907 Television 29 years 1940 Transistor 10 years