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Topic: Electrical circuit


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  The Energy Story - Chapter 4: Circuits
The current of electricity is the water flowing in the hose and the water pressure is the voltage of a circuit.
The diameter of the hose is the determining factor for the resistance.
In an electrical circuit - electrons move from the negative pole to the positive.
www.energyquest.ca.gov /story/chapter04.html   (1296 words)

  
 Electrical Circuit Breakers
Electrical energy is transported throughout an electrical circuit by the conductive path provided by electrically insulated wires.
Circuit breakers are routinely sized to limit the possible damage to the insulation material and not the copper wire.
Circuit breakers are typically calibrated as to be capable of responding to a bolted type fault as they result in sufficient current flow to cause either the thermal or the magnetic trip elements of open the circuit.
www.mikeholt.com /mojonewsarchive/NEC-HTML/HTML/ElectricalCircuitBreakers~20020419.htm   (3301 words)

  
  Ham-Shack.com : Principles Of Basic Electronics
Electricity is also the force that ignites the gasoline in the car's engine.
When a circuit's current is expressed in amperes, remember that it is a measure of the number of electrons flowing through the circuit.
It also states that the circuit resistance is equal to the voltage applied to the circuit divided by the current through the circuit.
www.ham-shack.com /electronics.html   (3495 words)

  
  Analogous Electrical and Mechanical Systems
Draw over circuit, replacing electrical elements with their analogs; current sources replaced by force generators, voltage sources by input velocities, resistors with friction elements, inductors with springs, and capacitors (which must be grounded) by capacitors.
Draw over circuit, replacing mechanical elements with their analogs; force generators by current sources, input velocities by voltage sources, friction elements by resistors, springs by inductors, and masses by capacitors (which are grounded).
Converting a circuit diagram to a mechanical 2 analog uses a similar procedure as electrical to mechanical 1 except that the voltages around a loop summed to zero (instead of the sum of currents at a node) is analogous to the sum of forces at a point being summed to zero.
www.swarthmore.edu /NatSci/echeeve1/Ref/Analogs/ElectricalMechanicalAnalogs.html   (1135 words)

  
 Superconducting-magnet electrical circuit having voltage and quench protection - Patent 5650903
Preferably, the electrical circuit additionally contains a bipolar semi-conductor switch (such as third and fourth diodes opposingly coupled together in parallel) having two electrodes, wherein the second lead of the resistor is coupled in series with one of the two electrodes.
For purposes of describing the invention, when the terminology "electrical impedance" is used in reference to any element (or group of elements) of the circuit 12, it refers to the conducting electrical impedance of that element (or group of elements) at the operating superconducting temperature (e.g., ten Kelvin) of the superconductive-coil assemblage 14.
This is important in magnet designs whose electrical insulation is not adequate to handle the high voltages experienced by the electrical circuit 12 of the invention during a quench event.
www.freepatentsonline.com /5650903.html   (3308 words)

  
 Electrical Circuit Theorems
At any instant the sum of all the currents flowing into any circuit node is equal to the sum of all the currents flowing out of that node:
At any instant the sum of all the voltage sources in any closed circuit is equal to the sum of all the voltage drops in that circuit:
Any linear voltage network which may be viewed from two terminals can be replaced by a voltage-source equivalent circuit comprising a single voltage source E and a single series impedance Z.
www.sas.org /circuitTheorems.html   (868 words)

  
 Electrical Circuit Breakers
In summation, circuit breakers may be called upon to open or close a circuit within a range of from no current flow to as much as fifteen (15) times or more its rated current.
Circuit breakers are routinely sized to limit thermal energy related damage to the electrical insulation material and not the copper wire.
Circuit breakers typically will respond to a short to ground that is of the low impedance type as current levels are typically multiples of load currents to which the circuit breaker has been manufactured to sense and then respond to.
www.maintenanceresources.com /referencelibrary/ezine/eleccircbreak.html   (3375 words)

  
 Testing Circuit Breakers
The electrical service panel is the main panel or cabinet through which electricity is brought into the building and then distributed to various branch circuits.
All circuit breakers or fuses in the service panel are connected to one or both of these bars.
Each 120-volt circuit has a fl or color wire connected to a circuit breaker or fuse; the white wire is connected to the neutral bus bar.
www.bobvila.com /HowTo_Library/Testing_Circuit_Breakers-Electrical_Boxes_and_Wiring-F2234.html   (575 words)

  
  Water circuit analogy to electric circuit
In a direct current (DC) electrical circuit, the voltage (V in volts) is an expression of the available energy per unit charge which drives the electric current (I in amperes) around a closed circuit.
In the water circuit, the pressure P drives the water around the closed loop of pipe at a certain volume flowrate F. If the resistance to flow R is increased, then the volume flowrate decreases proportionately.
The resistance to flow represented by a severe constriction in a water pipe is analogous to the resistance to electric current represented by a common electric "resistor".
hyperphysics.phy-astr.gsu.edu /hbase/electric/watcir.html   (730 words)

  
 Electrical network - Wikipedia, the free encyclopedia
Electrical networks that consist only of sources (voltage or current), linear lumped elements (resistors, capacitors, inductors), and linear distributed elements (transmission lines) can be analyzed by algebraic and transform methods to determine DC response, AC response, and transient response.
To design any electrical circuit, either analog or digital, electrical engineers need to be able to predict the voltages and currents at all places within the circuit.
Linear circuits, that is, circuits with the same input and output frequency, can be analyzed by hand using complex number theory.
en.wikipedia.org /wiki/Electrical_circuit   (653 words)

  
 Bell Electrical Supply, circuit breakers, transformers, starters, lamp recycling and more
We stock thousands of electrical products supplying local manufacturers, end users, electrical and mechanical contractors.
Bell Electrical Supply is a Hubbell Wiring Devices, plugs, connectors, IEC pins and sleeves.
We also supply electrical and mechanical contractors with Eaton circuit breakers, transformers, starters, motor controls, variable frequency drives, and sensors.
www.bell-electrical.com   (277 words)

  
 BoatUS BoatTECH Guides: Circuit Protection - DC Electrical System
A circuit can be grounded by a wire's insulation chafing through and contacting a grounded conductor, by the failure of equipment in the circuit, or by accidental grounding of the circuit during maintenance.
The voltage rating specifies the maximum voltage for the circuit in which the fuse is used.
Select a fuse or circuit breaker amperage rating that is larger than the maximum continuous current that will flow in the circuit (3, above) and smaller than the amperage capacity of the smallest wire (4, above).
www.boatus.com /boattech/CircuitProtect.htm   (885 words)

  
 Background for Troubleshooting Electrical Problems at Home - DIY
Your central breaker panel (or fusebox) directs electricity through your home as a number of separate circuits, each flowing "out" from its own circuit breaker (or fuse) on one wire and returning from whatever is using the electricity to another connection in the panel by means of another wire.
Circuits serving more than one outlet or light pass power on to successive locations by means of connections in the device itself or in the box the device is mounted in.
So on any one circuit there are many places where electricity can fail to get through -- from the circuit breaker and its connections, through a number of connections at devices and boxes, through switches, and at the contacts of a receptacle where you plug something in.
www.thecircuitdetective.com /bkgrd.htm   (2854 words)

  
 Section 14: Electrical   (Site not responding. Last check: )
The OSHA electrical standards were based on the National Fire Protection Association's standard NFPA 70E, Electrical Safety Requirements for Employee Workplaces, and the NFPA 70 Committee derived Part I of their document from the 1978 edition of the National Electrical Code (NEC).
The grounded and equipment grounding conductors of an electrical circuit must be marked or color coded in a way that allows employees to identify them and tell them apart from each other and from the other conductors in the circuit.
Grounding electrical circuits and electrical equipment is required to protect employees against electrical shock, safeguard against fire, and protect against damage to electrical equipment.
www.osha.gov /SLTC/smallbusiness/sec14.html   (4764 words)

  
 Home Tips: Main Electrical Panel and Circuit Breakers
All circuits are connected to a ground (a conductor that is driven into the earth).
A circuit breaker is a switch that may be shut off manually or may be tripped automatically by a failure in the electrical system, usually an overload that could cause the wires to heat up or even catch fire.
Larger-capacity circuit breakers are used for electric ovens, electric water heaters, electric clothes dryers, air conditioners and similar appliances that draw a lot of power.
www.hometips.com /hyhw/electrical/14bpanel.html   (429 words)

  
 Trip delay override for electrical circuit breakers (US4949214)
An automatic override circuit is responsive to the magnitude of instantaneous current flow through a monitored conductor to produce an output signal which can actuate a solenoid or a ground fault interrupter to automatically trip a circuit breaker in repsonse to an excursion of current flow which exceeds a predetermined maximum current overhead level.
The short circuit protector can automatically override a thermal trip delay and cause the circuit breaker to trip instantly or delay tripping for a prescribed period of short circuit events which exceed the maximum current overload level.
In both embodiments, the power distribution circuit is interrupted in response to a short circuit condition which would otherwise be tolerated during the thermal trip delay of a conventional circuit breaker.
www.delphion.com /details?&pn10=US04949214__   (388 words)

  
 Zinsco Electrical Panel and Circuit Breaker Hazards, Failures, Inspection, Detection, Repair, Replacement - Sylvania ...
Circuit breakers may fail to drop power even when they are switched off [remains to be verified--DF] - that is, the breaker may appear to be switched to the "off" position but internally it may still be conducting power to the circuit.
The circuit was 12 gauge on a 20 amp Zinsco breaker.
I asked the owner if the circuit ever tripped and she said that it had when she used the hair dryer while the heater was on, and the microwave was being used at the same time.
www.inspect-ny.com /electric/Zinsco.htm   (5590 words)

  
 CM Squared, Inc. - Electrical Definitions
Circuit breakers have replaced fuses as safety devices since they can be used over and over, instead of once like a fuse.
The easiest way to determine what devices are 'on' a particular circuit (if you don't have the electrical plan) is to turn off the breaker or pull the fuse and then see what doesn't have electricity anymore.
A device or group of devices that serves to govern, in some predetermined manner, the electric power delivered to the device to which it is connected.
www.cmsquared.com /electrical/definitions.html   (1431 words)

  
 Electricity - Simple Circuits
Electric current does work by heating fires, lighting lamps, ringing bells, electroplating, etc.
Electric current will therefore flow from the -ve terminal of a battery, through the lamp, to the
These are materials in which it is easy to get electrons to move and provide a flow of electric current.
www.can-do.com /uci/lessons99/electricity.html   (572 words)

  
 ELECTRICAL SAFETY IN THE WORKPLACE
Each electrical circuit breaker or fuse should be clearly marked with the name of the electrical appliance served by that circuit.
Breaker or fuse identification allows for interruption of the electrical current to the circuit in the event of an emergency due to electrical shock or faulty appliances, and assists in identification of circuit overloading.
Any electrical equipment that is damaged, malfunctioning or shows signs of unusual, excessive heating or producing "burning" odors, should be pulled from service and submitted for repair by qualified personnel.
www.sefsc.noaa.gov /HTMLdocs/electricalsafe.htm   (848 words)

  
 Circuit Breakers - Illinois Circuit Breakers -- Available Now!
To help protect an electrical circuit from damaged that is caused by an overload or a short circuit, circuit breakers are used and are an automatically-operated electrical switch.
If a circuit breaker's rating is lower then the prospectic short-circuit current then the circuit breaker may result in failire to safely interrupt the fault.
Circuit Breakers may be protected by fuses, that have the needed short circuit rating, in such circuits.
usedelectricalstuff.com /circuit-breakers.asp   (306 words)

  
 Electrical System: Fuses & Circuit Breakers   (Site not responding. Last check: )
There are three different types of blade fuses: the mini fuse (used in small-current applications), the standard auto fuse (used for most common circuits), and the maxi fuse (used for higher-current applications and in some case to replace a fusible link).
Circuit breakers are often located in fuse/relay panels, but some components like the headlight switch and power window motors have built-in circuit breakers.
Blown fuses or a tripped circuit breaker usually indicate more serious electrical circuit problems such as a short circuit or an electrical consumer that is using more current than the circuit is designed for.
www.carcare.org /Electrical/fuses_breakers.shtml   (301 words)

  
 How to Avoid the Top 10 Electrical Snafus
Basic electrical circuit design requires a complete path back to the battery through the ground circuit, and if it has high resistance, then the electrical device will operate poorly.
Bad grounds happen everywhere, but the worst case is when guys relocate the battery to the trunk, run a nice, thick multi-strand cable from the battery to the starter solenoid, then merely bolt the ground cable to the trunk floor or other easily accessible spot and leave it at that.
It sounds implausible, but keep in mind that the ground circuit must complete the current flow, so the ground side must always be as bulletproof as the positive side of the circuit.
www.carcraft.com /howto/116_0507_top_10_electrical_fixes   (1354 words)

  
 Marion County Building Inspection-Electrical Program   (Site not responding. Last check: )
Complete an Electrical Application and submit it to the Marion County Building Inspection Division or one of the cities with whom Marion County contracts.
Installation of one new electrical circuit limited to 20 amps each and, if relevant, connection of an appliance authorized under sections (2) and (3).
A restricted energy contractor or an electrical contractor using a licensed journeyman or restricted energy technician to make the installation shall use a minor I installation label for repair and replacement or extension of existing electrical installations not exceeding 100 volt-amps in Class II or II installations.
publicworks.co.marion.or.us /building/electric.asp   (1201 words)

  
 Electrical circuit suspension system (US6613979)
A device and method wherein electrical components are mechanically suspended and electrically interconnected in an insulative elastomeric body, such as silicone, thereby eliminating the need for a circuit board or other circuit substrate.
The device can be compressed and deformed to fit snugly within another device, such as the shell of an electrical connector or a plastic clamshell, simultaneously creating spring forces for reliable electrical contacts and an environmental seal.
wherein the components of the electrical circuit move with respect to each other and remain in constant electrical contact as the insulative body changes shape.
www.delphion.com /details?&pn=US06613979__   (390 words)

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