volts per meter การใช้

• This unit is equal to V / m ( volts per meter ); see below.
• The unit of measurement is volts per meter or dimensions MLT  " 3 A  " 1.
• Once the contacts get far enough apart, the arc will extinguish because the electric field strength ( volts per meter ) is insufficient to sustain it.
• SWER systems are designed to limit the voltage in the earth to 20 volts per meter to avoid shocking people and animals that might be in the area.
• In this case, the magnetic current density is concentrated in a two dimensional surface so the units of \ mathfrak { M } ^ i are volts per meter.
• The voltage depends on the length of the bolt, with the dielectric breakdown of air being three million volts per meter, and lightning bolts often being several hundred meters long.
• The electric field, \ vec { E }, ( in units of volts per meter ) is a vector field that can be defined everywhere, except at the location of point charges ( where it diverges to infinity ).
• Electrostriction can produce a strain of 0.1 % at a field strength of 2 million volts per meter ( 2 MV / m ) for the material called PMN-15 ( TRS website listed in the references below ).
• Further, the potential gradient inside a well-developed return-stroke channel is on the order of hundreds of volts per meter or less due to intense channel ionization, resulting in a true power output on the order of megawatts per meter for a vigorous return-stroke current of 100 kA.
• When the local electric field exceeds the dielectric strength of damp air ( about 3 million volts per meter ), electrical discharge results in a " strike ", often followed by commensurate discharges branching from the same path . ( See image, right . ) Mechanisms that cause the charges to build up to lightning are still a matter of scientific investigation.
• :: : : Another way to look at that is that at the precise point where the lightning strikes ( maybe a centimeter across )-the voltage at the ground is a bazillion volts-but 10 meters or so away, it's grounded ( so pretty much zero volts )-the number of volts per meter of ground is insanely high.
• For example, if " x " ( " t " ) represents the magnitude of the electric field component ( in volts per meter ) of an optical signal propagating through free space, then the dimensions of " X " ( " f " ) would become volt穝econds per meter and E _ s ( f ) would represent the signal's spectral energy density ( in volts 2 穝econd 2 per meter 2 ) as a function of frequency " f " ( in hertz ).
• Where " "'E "'" is the electric field vector with units of volts per meter ( analogous to " V " of Ohm's law which has units of volts ), " "'J "'" is the current density vector with units of amperes per unit area ( analogous to " I " of Ohm's law which has units of amperes ), and " ? " ( Greek " rho " ) is the resistivity with units of ohm穖eters ( analogous to " R " of Ohm's law which has units of ohms ).