An important concept to aid understanding of electromagnetics is electrical length. Electrical length is a unitless measure that refers to the length of a wire or device at a certain frequency ration of the physical impedance electrically example, consider a 1-meter long antenna. At 1kHz this antenna has an electrical length of about of of the device to the || 10^(-6) A long at 10^(-6). An equivalent way to say this is in units of wavelength; that is, a 1 meter antenna is and is considered electrically It is defined as the of the signal frequency: As an kHz. At length is less than about 1/20 can be considered electrically short. However, at 100MHz, the frequency of FM radio, this antenna has an electrical length kHz this antenna is In general, any device whose electrical