Electronics Engineering

Advantages:

Cheap

Long distance communication

Quick

An electrical resistor with a relatively large negative temperature coefficient of resistance. Thermistors are useful for measuring temperature and gas flow or wind velocity.
A thermistor can also be called a thermal resistor. It is a semiconductor device made of materials whose resistance varies as a function of temperature. It is used to compensate for temperature variation in other components of an electronic circuit, sometimes taking the place of a fuse with its ability to limit current when overheated by an electrical fault. It is often used as part of temperature control circuitry, among its many other applications.

After much more research the real answer I believe is here:

http://www.patentstorm.us/patents/4703171/fulltext.html

I have found that William Kahl invented the infrared motion sensor for burglar alarms first and then he sent in an application for the infrared light switch motion sensor in 1985. There had been other motion sensor light switches but this specific infrared motion sensor (PIR) is the one that is most used today residentially and in companies as well.

total resistance of a parallel connection network of resisters is

equals the total resistance divided by one.

1/total R = 1/R1+1/R2+1/R3+................+1/RN

since we get 1/total R from the above formula, to get total resistance (total R) just reciprocate the answer.

secondly, if u have only two resistors connected in parallel say R1 & R2, then total Resistance total R=(R1*R2 )/R1+R2

inform.mayaprasad@gmail.com

1.) what is operating system? 2.) what an array ? how is an array different from ordinary variable ?

Power = Current * Voltage

P = I*V


therefore for the same power, when the current decreases, the voltage increases

this is the concept that is used in transformers for power transmission (increasing the voltage and reducing current to reduce power loss in transmission lines).

yes because of bulb resistance :)

A potentiometer is another name for a variable resister used for voltage dividing. Potentiometers have three tabs on them The two outer most tabs have the full resistance of the device across them. The center tab is connected to the wiper that slides across the surface of the resister. A voltage is applied to the two outside tabs on the potentiometer. A voltage of your choosing will appear across either the left tab to the center wiper tab or from the right tab and the center wiper tab. A potentiometer of this type is used to control the speed output of variable frequency drives. A 10K potentiometer has 10VDC applied across the two outside tabs If the drive sees the full 10 volts it allows the drive to go to full output and the motor will run at full speed. With the potentiometer's center tab wiper at half position a voltage of 5 VDC will appear to the drive. When the drive sees the 5 volts it tells the drive to go to half speed output and the motor will run at half speed. This potentiometer is linear so no matter where the wiper is positioned, the motor speed will follow the potentiometer settings from 1% right up to 100%

4 volts and how many amps? Watts = amps x volts. It depends on the amount of current (in Amps) flowing at 4 Volts...

See Ohms Law: Watts = Volts x Amps

If you have 2 Amps flowing at 4 Volts you are dissipating/consuming 8 Watts.

If you have 10 Amps flowing at 4 Volts you are dissipating/consuming 40 Watts.

The terminals on a MOSFET are called the "Source", "Drain", and "Gate". Just as with a bipolar junction transistor (BJT) the direction of current flow will be based on the doping configuration of the semiconductor. In a MOSFET, the doping configuration can be either n-channel or p-channel, but with MOSFETS, they also come in a "normally on" or "normally off" configuration, which is specified by being either "depletion mode" or "enhancement mode", respectively.

Ohms law states that E=I * R, or voltage equals current times resistance. Therefore current equals voltage divided by resistance. 120v divided by 16 ohms equals 7.5 amps.

You don't.

...unless you want to directly measure the current in a circuit branch. That's the purpose of an ammeter.

You can also use a volt meter if you know the resistance of a resistor in that branch to determine current (assuming DC circuit here) - current = voltage / resistance. This may be more useful for circuitry that is on a breadboard, since inserting an ammeter may not be practical.

This question can be understood with more than one meaning.

One meaning is that of a user that desires to connect an access point to retransmit internet from their cable modem to extend the bandwidth provided by their Cable ISP wireless to one or more users. For this, one must first check the acceptable use policy of the company which is providing the cable router. The hookup is quite straightforward. Setup the cable modem to deliver a static IP to the wireless router. Let the wireless router reassign IPs to the end users. If servers are to be parked behind the wireless router, then more engineering is required, which will not be covered here in this response. (Please ask another question regarding configuring servers behind cable modems.)

There are wireless router / gateway devices that you can hool up to a cable modem to provide auto failoever and auto failback during cable internet outages. One such device is the Nexus Hawk www.nexushawk.com. This wireless router device is inserted between the cable modem and the user network. The wireless router then provides internet access during intermitent outages. There are a few such products advertising this feature, but to date I have only seen the Nexus Hawk in use. I invite others to write of other products they have seen working in the field. This question can be understood with more than one meaning.

One meaning is that of a user that desires to connect an access point to retransmit internet from their cable modem to extend the bandwidth provided by their Cable ISP wireless to one or more users. For this, one must first check the acceptable use policy of the company which is providing the cable router. The hookup is quite straightforward. Setup the cable modem to deliver a static IP to the wireless router. Let the wireless router reassign IPs to the end users. If servers are to be parked behind the wireless router, then more engineering is required, which will not be covered here in this response. (Please ask another question regarding configuring servers behind cable modems.)

There are wireless router / gateway devices that you can hool up to a cable modem to provide auto failoever and auto failback during cable internet outages. One such device is the Nexus Hawk www.nexushawk.com. This wireless router device is inserted between the cable modem and the user network. The wireless router then provides internet access during intermitent outages. There are a few such products advertising this feature, but to date I have only seen the Nexus Hawk in use. I invite others to write of other products they have seen working in the field.

If light meets the inner surface of the cladding (the core - cladding interface) at greater than or equal to Qc then TIR occurs. So all the energy in the ray of light is reflected back into the core and none escapes into the cladding. The ray then crosses to the other side of the core and, because the fiber is more or less straight , the ray will meet the cladding on the other side at an angle which again causes TIR. The ray is then reflected back across the core again and the same thing happens. In this way the light zig zags its way along the fiber. This means that the light will be transmitted to the end of the fiber.

In reality the light which enters the fiber is a focused beam, consisting of many millions of "rays" behaving in a similar way. They all zig zag along the core of the fiber, crossing over each other, and filling up the core with light. A pulse of light traveling along the core of the fiber is really a bundle of these rays.

That would be the current. The international unit for electrical current is the Ampere.

Spelt ampere (with a lower case "a"). The abbreviation is given the upper case "A".

A rectifier, typically called a diode. It stops reverse current flow and only allows current to flow in one direction. 4 diodes are used for what is called "Full wave rectification". Along with a capacitor and a choke (or coil), almost pure DC can be achieved.

It depends. If they are multiple voltage 110-220v appliances (such as most computer power supplies are) they obviously can be, taking special care to check if a switch has to be flipped to use the other voltage. If they are 220v-only devices, you need some sort of a converter to use them. That can be for instance a 110v/220v transformer, but if WILL be bulky and heavy as hell, and available for relatively small power only. Or you might use an electronic 110v/220v power converter, if you can find one, which might be considerably lighter and possibly available for higher power, but it probably won't be that cheap either. If the appliance is a fairly generic one, buying a new 110v model is probably the easiest and cheapest way to do it. It should be noted that a lightbulb- or heating-element-type appliance should still work with the smaller voltage, just weaker, as opposed to the reverse situation of supplying 220v to a 110v device, which would certainly burn out. It is however rather pointless to try to do it, and HIGHLY NOT RECOMMENDED.

Electromotive force is measured in volts.

A complete circuit is where a current can flow without any leaks.

A series circuit is like the old string of Christmas Tree lights. If any bulb burns out none of the others light because the circuit is now open. The same would happen if you used series wiring in a house. Another draw back is the number of devices in series governs how much voltage would be across each device.

If the switch is what is keeping the load from turning on, then yes, there is a voltage across the open switch.