# current from the collector

• Feb 09, 2021 · A collector current is referred to when identifying the output current from the transistor to the transistor’s collector terminal. The collector current, along with the base current, is a product of the energy produced through the emitter circuit, which is divided at the base current’s generation through the transistor. Only a fraction of the exiting current is base current, and the remaining portion is considered the collector current.

• ## How to Calculate the Collector Current, Ic, of a Transistor

The collector current, Ic, of a transistor is the amplified output current of a bipolar junction transistor. There are several ways to find the collector current, Ic, of a transistor. And it all depends on what information is already known about the transistor: 1st Way to Calculate Collector Current Ic. Using Known Values

• The current through the 10K resistors and diodes is (20V-1.4V)/20K = 0.93mA (so far so good) So the base voltage is 10.7V above the -20V rail and therefore the emitter is at 10.0V above the -20V rail so the emitter current is ~10.0V/4.7K = 2.1mA. Since base current is said to be negligible, collector current is also 2.1mA.

• Ica (what they are the "collector light current") is the current through the collector and out the emitter vs. Vce (collector to emitter voltage) at different intensity of light impinging on the device. So, for example, if you had a Vce of 10V and shined a light of 0.1 mW/cm2 on it, you should expect an Ica of about 0.3 mA (more or less).

• Collector pole. A collector pole is the pole at the end of a bumper car.It has a contact shoe on top. Electric cranes. Electric overhead cranes and gantry cranes may use a current collector system to provide power over the full length of their operating area.

• The current in the overhead system is collected with the help of sliding contact collector mounted on the roof of the vehicle. The main requirement of a current collector is that it should, under no circumstances, leave the contact of overhead equipment. Contact wire in all practical installations is never perfectly horizontal, it rises and falls depending upon the weight of the contact wire, and distance between droppers.

• • ## Bipolar junction transistor – Wikipedia

The common-base current gain is approximately the gain of current from emitter to collector in the forward-active region. This ratio usually has a value close to unity; between 0.980 and 0.998. It is less than unity due to recombination of charge carriersas they cross the base region. Alpha and beta are related by the following identities:

• With the collector terminal of the transistor connected directly to V CC and no collector resistance, (R C = 0) any collector current will generate a voltage drop across the emitter resistor R E. However, in the common collector amplifier circuit, the same voltage drop, V E also represents the output voltage, V OUT.

• The current collector removes current from the supercapacitor (or battery). Collectors on the market are usually made of aluminum or copper foil.

• Assume that the collector is connected to a potential such that the transistor is in active mode (eg. grounded). Assume junctions have 0.7V across them. The current through the 10K resistors and diodes is (20V-1.4V)/20K = 0.93mA (so far so good) So the base voltage is 10.7V above the -20V rail and therefore the emitter is at 10.0V above the -20V rail so the emitter current is ~10.0V/4.7K = 2.1mA.

• In this formula, Collector current uses Saturation current, Voltage across emitter-base junction and Thermal voltage. We can use 11 other way(s) to calculate the same, which is/are as follows – collector_current = Base Transport factor * Base Current; collector_current = Current Amplification factor * Emitter current; collector_current = Alpha * Emitter current

• ## Current Collection from Overhead System: 3 Collectors

The current in the overhead system is collected with the help of sliding contact collector mounted on the roof of the vehicle. The main requirement of a current collector is that it should, under no circumstances, leave the contact of overhead equipment. Contact wire in all practical installations is never perfectly horizontal, it rises and falls depending upon the weight of the contact wire, and distance between droppers.

• These new devices are rated at 1.0 A of continuous collector current, 25-V collector-to-emitter voltage, and have an energy efficient low VCE(SAT) of 25 mV for NPN and 30 mV for PNP. Low [V.sub.CE(SAT)] transistors come in ultra-miniature TLM621 package

• The common-base current gain is approximately the gain of current from emitter to collector in the forward-active region. This ratio usually has a value close to unity; between 0.980 and 0.998. It is less than unity due to recombination of charge carriersas they cross the base region. Alpha and beta are related by the following identities:

• Collector Current. Normal transistor actionresults in a collector-to-emitter current which is about 99% of the total current. The usual symbols used to express the transistor current relationships are shown. The proportionality β can take values in the range 20 to 200 and is not a constant even for a given transistor.

• In fact, the current gain of a transistor is just I c / I b = β = τ r / τ d, since that many electrons get swept into the collector for each that recombines in the base. The trick to making a good transistor is to maximize that ratio; hence the thin-ness of the base region.

• ## Current collector – Wikipedia

Electric current collectors are used by trolleybuses, trams, electric locomotives or EMUs to carry electrical power from overhead lines or electrical third rails to the electrical equipment of the vehicles. Those for overhead wires are roof-mounted devices, those for third rails are mounted on the bogies. Current collectors are also electric bridging components that collect electrical current generated at the electrodes of electrochemical devices, such as lithium-class battery cells, and connect

• Short-circuit collector current at a unity-gain frequency calculator uses collector_current = ( Transconductance – Complex frequency variable * Collector-base junction capacitance )* Finite input voltage to calculate the Collector current, The Short-circuit collector current at a unity-gain frequency formula, in this circuit the collector is

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