A succession of sparks jumping from the key to the back of his hand showed that lightning was indeed electrical in nature.

It is not known whether Franklin ever performed his experiment, but on May 10, 1752, Thomas-François Dalibard of France conducted a similar experiment ( using a 40-foot ( 12 m ) iron rod instead of a kite ) and extracted electrical sparks from a cloud.

When the key is closed, and the apparatus in operation, there are trains of intermittent electrical oscillations set up in the circuit, and if the terminals of the secondary circuit of the oscillation transformer are near together, there is high potential high frequency oscillatory sparks passing between them.

The feature film is also filled with subliminal messages, many hidden in single frames during the " Wizard Run " sequence ( which was remade and expanded from the original short film ), or hidden in electrical sparks generated by various happenings in the film.

Also, when sugar crystals are crushed, tiny electrical fields are created, separating positive and negative charges that then create sparks while trying to reunite.

Electric discharge machining ( EDM ), sometimes colloquially also referred to as spark machining, spark eroding, burning, die sinking or wire erosion, is a manufacturing process whereby a desired shape is obtained using electrical discharges ( sparks ).

Their initial process used a spark machining process, named after the succession of sparks ( electrical discharges ) that took place between two electrical conductors immersed in a dielectric fluid.

These sparks usually strike one at a time because it is very unlikely that different locations in the inter-electrode space have the identical local electrical characteristics which would enable a spark to occur simultaneously in all such locations.

Prior to this time, power tools were metal castings that often conducted electrical sparks or current into the user as well as being very heavy.

Sections of the book included: Of electricity in general ; Of the electrical machine, with directions for exciting it ; The properties of electric attraction and repulsion illustrated by experiments with light bodies ; Entertaining experiments by the attraction and repulsion of light bodies, with some remarks on electrical attraction ; Of the electrical sparks ; Of the electrified points ; Of the Leyden phial ; Of the electrical battery, and the lateral explosion of charged jars ; Of the influence of pointed conductors for buildings ; To charge a plate of air ; Of the electrophorus ; Of atmospherical electricity ; Of the diffusion and subdivision of fluids by electricity ; Of the electric light in vacuo ; Of medical electricity ; Miscellaneous experiments and observations ; An essay on magnetism.

* won't generate sparks ( due to electrical components ) in refineries, chemical, petrochemical and many other industries where there is a fire hazard threat.

Although experimenting with static electricity may be fun, similar sparks create severe hazards in those industries dealing with flammable substances, where a small electrical spark may ignite explosive mixtures with devastating consequences.

Areas with potentially explosive gases need further protection to prevent electrical sparks from igniting the gases, and internal conduit gas-tight barriers to prevent potentially ignited gases from traveling inside the conduit to other parts of the building.

Although sparks and arcs are usually undesirable, they can be useful in everyday applications such as spark plugs for gasoline engines, electrical welding of metals, or for metal melting in an electric arc furnace.

Focus puller Harry Oakes recalled, however, that a Newman-Sinclair clockwork camera had to be used for some scenes because of the danger posed by sparks from electrical equipment.

Instead of placing an object on photo-sensitive paper, then exposing it to light, he produced the image by causing electrical sparks to erupt over the on surface of a 7-by-2. 5-foot sheet of film laid on a metal plate.

For example, hydrogen gas, natural gas, or petrol / gasoline vapor mixed with air can be ignited by sparks produced by electrical apparatus.

This high voltage, high frequency burst can be damaging to some vehicle electrical systems and electronics, because induced voltages on vehicle wiring can also cause small conductive sparks in the vehicle wiring or within semiconductor packaging.

On a rainy day, one can see sparks when either type of train pantograph hits the electrical wire junction.

A synapse " sparks " the impulse between neurons through electrical and chemical means.

( The penalties handed out in the electrical case, which included jail sentences, were unprecedented in anti-trust prosecutions, perhaps because the conspirators had displayed unusual ineptness in their pricing activities.

The production controllers were quite different and a great disappointment to the electrical and software development teams.

One limitation ( also afflicting the Intel Pentium III ) is that SRAM cache designs at the time were incapable of keeping up with the Athlon's clock scalability, due both to manufacturing limitations of the cache chips and the difficulty of routing electrical connections to the cache chips themselves.

Early computer buses were parallel electrical wires with multiple connections, but the term is now used for any physical arrangement that provides the same logical functionality as a parallel electrical bus.

Anecdotally termed the " digit trunk ", they were named after electrical power buses, or busbars.

In the early cold cathode vacuum tubes, called Crookes tubes, this was done by using a high electrical potential between the anode and the cathode to ionize the residual gas in the tube ; the ions were accelerated by the electric field and released electrons when they collided with the cathode.

* 1903: Two first diesel-powered ships were launched, both for river and canal operations: Petite-Pierre in France, powered by Dyckhoff-built diesels, and Vandal tanker in Russia, powered by Swedish-built diesels with an electrical transmission.

The names were reused in 1873 by a Committee of the British Association ( of which Everett was reporter ) that proposed using the centimetre-gram-second system for electrical and dynamical systems.

Radio waves were not detected first from a natural source, but were rather produced deliberately an artificially by the German scientist Heinrich Hertz in 1887, using electrical circuits calculated to produce oscillations in the radio frequency range, following recipies suggested by the equations of James Clerk Maxwell.

However, by the end of the 19th century, other key figures in the progress of electrical engineering were beginning to emerge.

< cite id =" demographics "> Note I </ cite >-There were around 300, 000 people () working as electrical engineers in the US ; in Australia, there were around 17, 000 () and in Canada, there were around 37, 000 (), constituting about 0. 2 % of the labour force in each of the three countries.

The word electricity is from the New Latin ēlectricus, " amber-like ", coined in the year 1600 from the Greek ήλεκτρον ( electron ) meaning amber, because electrical effects were produced classically by rubbing amber.

Thales ' experiments with amber rods were the first studies into the production of electrical energy.

Electric motors of increasing efficiency were constructed throughout the 19th century, but commercial exploitation of electric motors on a large scale required efficient electrical generators and electrical distribution networks.

In addition to the relatively looser constraints on character and message at lower budgets, the nature of B production lent itself to the noir style for directly economic reasons: dim lighting not only saved on electrical costs but helped cloak cheap sets ( mist and smoke also served the cause ); night shooting was often compelled by hurried production schedules ; plots with obscure motivations and intriguingly elliptical transitions were sometimes the consequence of hastily written scripts, of which there was not always enough time or money to shoot every scene.

Starting with épée in 1936, side-judges were replaced by an electrical scoring apparatus, with an audible tone and a red or green light indicating when a touch landed.

He became known for his early predictions about the properties of the electrical particles trapped around the earth, which were partly verified by later discoveries in satellite experiments.

Before World War II, mechanical and electrical analog computers were considered the " state of the art ", and many thought they were the future of computing.

Before the invention of reliable electrical methods, hot tube and flame methods were used.

The electrical engineering and computer science students of the Budapest University of Technology and Economics turn their Schönherz Dormitory into a giant display ( the " Matrix ") at their annual Schönherz Cup competition, where amongst others, teams compete in creating the most interesting and funny animation.

The electron is by far the least massive of these particles at, with a negative electrical charge and a size that is too small to be measured using available techniques.

The majority of aircraft power their avionics using 14-or 28 ‑ volt DC electrical systems ; however, larger, more sophisticated aircraft ( such as airliners or military combat aircraft ) have AC systems operating at 400 Hz, 115 volts AC.

Instead of using RS-422's balanced transmit and receive circuits, the AppleTalk Personal Network cabling used a single common electrical ground, which limited speeds to about 500 kbit / s, but allowed one conductor to be removed.

The common practice of using pipes for electrical grounding is discouraged, as it accelerates lead corrosion.

There are codes using colors, like traffic lights, the color code employed to mark the nominal value of the electrical resistors or that of the trashcans devoted to specific types of garbage ( paper, glass, biological, etc.

Steven Sasson, an electrical engineer working for Kodak, invented the first digital still camera using a Fairchild CCD in 1975.

Before it emerged as a unique discipline, control engineering was practiced as a part of mechanical engineering and control theory was studied as a part of electrical engineering, since electrical circuits can often be easily described using control theory techniques.

* Morse code uses six digital states — dot, dash, intra-character gap ( between each dot or dash ), short gap ( between each letter ), medium gap ( between words ), and long gap ( between sentences )— to send messages via a variety of potential carriers such as electricity or light, for example using an electrical telegraph or a flashing light.

* Differential mobility analysis, a technique that sorts particles by diameter using electrical mobility

Alternatively, electrical engineers are usually concerned with using electricity to transmit energy, while electronic engineers are concerned with using electricity to process information.

In his classic UHF experiments of 1888, Heinrich Hertz transmitted ( via a spark-gap transmitter ) and detected radio waves using electrical equipment.

The other processes, electricity transmission, distribution, and electrical power storage and recovery using pumped-storage methods are normally carried out by the electric power industry.

Almost all commercial electrical generation is done using electromagnetic induction, in which mechanical energy forces an electrical generator to rotate.

The electrical energy efficiency of a typical industrial induction motor can be improved by: 1 ) reducing the electrical losses in the stator windings ( e. g., by increasing the cross-sectional area of the conductor, improving the winding technique, and using materials with higher electrical conductivities, such as copper ), 2 ) reducing the electrical losses in the rotor coil or casting ( e. g., by using materials with higher electrical conductivities, such as copper ), 3 ) reducing magnetic losses by using better quality magnetic steel, 4 ) improving the aerodynamics of motors to reduce mechanical windage losses, 5 ) improving bearings to reduce friction losses, and 6 ) minimizing manufacturing tolerances.