Using a solar roof, solar cells can provide electric power.

Using an electric field, molecules ( such as DNA ) can be made to move through a gel made of agar or polyacrylamide.

Using quantum theory Dirac showed that if magnetic monopoles exist, then one could explain the quantization of electric charge --- that is, why the observed elementary particles carry charges that are multiples of the charge of the electron.

* 1879 – Using a filament of carbonized thread, Thomas Edison tests the first practical electric incandescent light bulb ( it lasted 13½ hours before burning out ).

Using this setup, he discovered the direct proportionality between the intensity of light and the induced photo electric current ( the first law of photoeffect or Stoletov's law ).

* October 22 – Using a filament of carbonized thread, Thomas Edison tests the first practical electric light bulb ( it lasts 13½ hours before burning out ).

Using a less strict definition of the electro-optic effect allowing also electric fields oscillating at optical frequencies, one could also include nonlinear absorption ( absorption depends on the light intensity ) to category a ) and the optical Kerr effect ( refractive index depends on the light intensity ) to category b ).

Using this new understanding, they obtained an efficiency of about 90 %, and proved that the electric motor was a practical alternative to the heat engine.

Using quantum mechanics it can be shown that for an electron in an external electric field E, the acceleration a < sub > ℓ </ sub > along coordinate direction ℓ is:

Using a known electric field, Millikan and Fletcher could determine even the charge on oil droplets in mechanical equilibrium.

Using Ampere's law, one can determine the magnetic field associated with a given current or current associated with a given magnetic field, providing there is no time changing electric field present.

Using electric propulsion ( 8 ion engines, plus Hall thrusters of varying sizes ) would make it possible to go into and leave orbits around the moons of Jupiter, creating more thorough observation and mapping windows than exist for current spacecraft, which must make short fly-by maneuvers because of limited fuel for maneuvering.

Using Ohm's law, J σE, which relates current density J to electric field E in terms of a material's conductivity σ, and assuming isotropic homogeneous conductivity, the equation can be written as

Using a piezoelectric polymer that will deform when exposed to a specific electric field broadcast from a key fob ( like a car alarm ) the valve will open or close, preventing the passage of sperm, but not seminal fluid.

Using a sensitive galvanometer of Leopoldo Nobili, he was able to prove that injured excitable biological tissues generated direct electrical currents, and that they could be summed up by adding elements in series, like in Alessandro Volta ’ s ( 1745-1827 ) electric pile.

Using the cat that Donatti's assistant Junk has caught in the street, Donatti demonstrates the first of these horrors: the cat is locked in a cage and tormented with electric shocks.

Using the Third Rail system, trains powered by electric motor cars ( or carriages ) began running on 17 April 1916 but as Horwich was by then involved in war work, deliveries of the new electric stock were delayed and it was not until August 1916 that steam trains were withdrawn from the route.

Using a procedure similar to that above, the maximum electric field for a center-fed short dipole is

Using these low-tech power supplies it is possible to generate a sufficiently high electric field gradient across an accelerating gap to accelerate deuterium ions into a deuterated target to produce the D + D fusion reaction.

Using renewable energy source to generate hydrogen by electrolysis would require greater energy input than direct use of the renewable energy to operate electric vehicles, because of the extra conversion stages and losses in distribution.

Using one of Fu Manchu's own weapons — a death ray that shoots an electric current — the men incapacitate the arch-villain as he raises the sword to execute Sheila.

Using the Lorenz gauge, Maxwell's equations can be written compactly in terms of the magnetic vector potential A and the electric scalar potential ϕ:

Using an imaginary pillbox, it is possible to use Gauss's law to explain the relationship between electric displacement and free charge.

Using the current official IAU constellation boundaries — and taking into account the variable precession speed and the rotation of the ecliptic — the solstices shift through the constellations as follows ( expressed in astronomical year numbering in which the year 0

* Using an uninitialized variable

Using variable rates over time, or discounting " guaranteed " cash flows differently from " at risk " cash flows, may be a superior methodology but is seldom used in practice.

Using this initial burst efficiently is vital and automatically variable pitch propellers help here, together with timer-operated changes of wing and tailplane incidence and of rudder setting.

Using relatively simple dummy variable regression analysis the implicit utilities for the levels can be calculated.

* Using the power series expansions above, the Fresnel integrals can be extended to the domain of complex numbers, and they become analytic functions of a complex variable.

Using a variable ( instead of a literal ) takes advantage of a compiler's checking.

Using this information, the compiler can construct a graph such that every vertex represents a unique variable in the program.

Using a toy model he has argued that such a theory could avoid the usual Bell inequality arguments that disallow such a hidden variable theory.

Using ( 1 ), various Bell inequalities can be derived, giving restrictions on the possible behaviour of local hidden variable models.

Using a variable name in a program ( e. g .,'d ') brought the value of variable'd '

Using aqueous electrodes introduces undefined, variable, and unmeasurable junction potentials to the cell in the form of a liquid-liquid junction as well as different ionic composition between the reference compartment and the rest of the cell.

Using that variable to compare countries, it reports that resource wealth in the ground correlates with slightly higher economic growth and slightly fewer armed conflicts.

Using the storage class instead of is a hint to the compiler to cache the variable in a processor register.

Using the expression pedal, the musician can not only emulate dedicated effects such as wah, but also have real time control of almost any variable such as volume, tone, echo repeats, effect speed, and so on.

Using the Jacobian determinant and the corresponding change of variable that it gives is the basis of coordinate systems such as polar, cylindrical, and spherical coordinate systems.

This procedure is equivalent to substituting the negation of the variable for the variable itself: For example, to find the number of negative roots of, we equivalently ask how many positive roots there are for in Using Descartes ' rule of signs on gives the number of positive roots of g, and since it gives the number of positive roots of f, which is the same as the number of negative roots of f.

Using a measuring cup to measure bulk foods which can be compressed to a variable degree such as chopped vegetables or shredded cheese leads to large measurement uncertainties.