Electronics Ashish
Terms
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- 1 C
- 1.6 *10 18 electrons
- Ligtning as staic discharge
- due to winds and rain transfer charges between clouds or between clouds and earth. also dust
- Neon glass staic discharge
- two electrodes so discharge seej
- sheet styroform shock on removing
- work done
- switch
- a switch is an electrical component that can break an electrical circuit, interrupting the current or diverting it from one conductor to another
- switch mechanism
- The mechanism actuating the transition between these two states (open or closed) can be either a "toggle" (flip switch for continuous "on" or "off") or "momentary" (push-for "on" or push-for "off") type.
- Switch use
- Switches may be operated by process variables such as pressure, temperature, flow, current, voltage, and force, acting as sensors in a process and used to automatically control a system. For example, a thermostat is a temperature-operated switch used to control a heating process. A switch that is operated by another electrical circuit is called a relay
- an ideal switch
-
has no current limit during its ON state
has infinite resistance during its OFF state
has no voltage drop across the switch during its ON state
has no voltage limit during its OFF state
has zero rise time and fall time during state changes
switches without "bouncing" between on and off positions - switch contact material choosen
- he contact material is chosen for its resistance to corrosion, because most metals form insulating oxides that would prevent the switch from working. Contact materials are also chosen on the basis of electrical conductivity, hardness (resistance to abrasive wear), mechanical strength, low cost and low toxicitySometimes the contacts are plated with noble metals. They may be designed to wipe against each other to clean off any contamination. Nonmetallic conductors, such as conductive plastic, are sometimes used. In order to prevent the formation of insulating oxides, a minimum wetting current may be specified for a given switch design.
- Contact terminology
- The terms "make" for closure of contacts and "break" for opening of contacts are also widely used.
- Learn about relay : sites
-
http://www.bcae1.com/relays.htm
http://www.vishay.com/solid-state-relays/
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