The speed of light in free space (
), which is the phase velocity of any electromagnetic radiation in free space, is
m/s. This is commonly rounded up to
m/s. This rounding incurs error of
%, which is usually much less than other errors present in electrical engineering calculations.
The charge of an electron is
C. The constant
C is known as the “elementary charge,” so the charge of the electron is said to be
The permittivity of free space (
The permeability of free space (
The wave impedance of free space (
) is the ratio of the magnitude of the electric field intensity to that of the magnetic field intensity in free space and is
. This is also sometimes referred to as the intrinsic impedance of free space.
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