Search results
Results from the WOW.Com Content Network
Electrical equipment may be designed with a floating ground for one of several reasons. One is safety. For example, a low-voltage DC power supply, such as a mobile phone charger, is connected to the mains through a transformer of one type or another, and there is no direct electrical connection between the current return path on the low-voltage side and physical ground (earth).
Two-wire circuits in new installations are limited to intercom and military field telephone applications, though these too are being supplanted by modern digital communication modes. To communicate in both directions in the same wire pair, conversion between four-wire and two-wire was necessary, both at the telephone and at the central office .
The ground loop constitutes a conductive wire loop which may have a large area of several square meters. According to Faraday's law of induction , any time-varying magnetic flux passing through the loop induces an electromotive force (EMF) in the loop, causing a time varying current to flow.
They are often used to simplify the physical setup of a system and provide a neater connection between two pieces of equipment. [9] For example, in sound reinforcement, a multicore cable is often used to connect all the microphones on stage to the mixing console. This is much easier than running many individual cables, which can become messy ...
A ground conductor only carries significant current if there is a circuit fault that would otherwise energize exposed conductive parts and present a shock hazard. In that case, circuit protection devices may detect a fault to a grounded metal enclosure and automatically de-energize the circuit, or may provide a warning of a ground fault.
The receiving circuit responds to the difference between the two signals, which results in a signal with a magnitude twice as large. The symmetrical signals of differential signalling may be referred to as balanced , but this term is more appropriately applied to balanced circuits and balanced lines which reject common-mode interference when ...
Some of the most common ways to send or receive money electronically include ACH, EFT, and wire transfers.
Double-wire dipole whose characteristic impedance in free space is around 300 Ω. Dipole Although the center impedance at resonance is approximately 73 Ω in free space , in actual use it varies between 30 and 100 Ω , depending on height above ground, so with high-impedance feedline a T-match or Y-match feed will probably be necessary.