doc - Seattle Central College
... In general, an LED needs a current limiting resistor to be used without damaging the part. This is because once a certain forward voltage is established across the LED, it does nothing to limit the current, and the current will generally get very high. This will now be investigated. First, a power s ...
... In general, an LED needs a current limiting resistor to be used without damaging the part. This is because once a certain forward voltage is established across the LED, it does nothing to limit the current, and the current will generally get very high. This will now be investigated. First, a power s ...
Electric Current & Resistance
... Electrons do not flow like water in a pipe. In the absence of voltage, they move randomly at high speeds, due to their temperature. When a voltage is applied, a very small drift velocity is added to the thermal motion, typically around 1 mm/s; this is enough to yield the observed current. ...
... Electrons do not flow like water in a pipe. In the absence of voltage, they move randomly at high speeds, due to their temperature. When a voltage is applied, a very small drift velocity is added to the thermal motion, typically around 1 mm/s; this is enough to yield the observed current. ...
Product Profile
... module provides energy storage for bridge power uninterruptible power supplies (UPS) and improves power quality for voltage spikes and brownouts. ...
... module provides energy storage for bridge power uninterruptible power supplies (UPS) and improves power quality for voltage spikes and brownouts. ...
Lecture Outlines Chapter 24 James S. Walker Physics, 3
... If XL = XC, the phase angle is zero, and the voltage and current are in phase. The power factor: ...
... If XL = XC, the phase angle is zero, and the voltage and current are in phase. The power factor: ...
This article describes a analog IR sensor which gives output voltage
... Circuit is simple. This circuit uses differentiator to eliminate constant voltage component corresponding to ambient light. To be able to use this sensor it requires that transmitter be OFF normally and must be switched ON only when we want to sense. A transistor does the job of switch to make IR tr ...
... Circuit is simple. This circuit uses differentiator to eliminate constant voltage component corresponding to ambient light. To be able to use this sensor it requires that transmitter be OFF normally and must be switched ON only when we want to sense. A transistor does the job of switch to make IR tr ...
Electric Circuit Theory, Experiment 1:The Linear Resistor and OHM`s
... Connect wires from the sequence output pin of the function generator object to the sequence input pins of the multimeter and oscilloscope drivers. These connections tell the two measuring instruments to take a reading after each new input voltage value is received by the function generator. You can ...
... Connect wires from the sequence output pin of the function generator object to the sequence input pins of the multimeter and oscilloscope drivers. These connections tell the two measuring instruments to take a reading after each new input voltage value is received by the function generator. You can ...
Megger Insulation Tester Safety
... amplitude but its duration is typically very short; 50 µsec as an example. On its own, the transient will cause little damage. But when it occurs on top of the normal mains sinusoidal supply voltag ...
... amplitude but its duration is typically very short; 50 µsec as an example. On its own, the transient will cause little damage. But when it occurs on top of the normal mains sinusoidal supply voltag ...
BST-12/125-D48-C Datasheet
... is a quick 200μsec, while output ripple and noise are typically 75mVp-p. These rugged modules are fully encapsulated with a thermally conductive potting compound that contributes to their outstanding moisture/vibration resistance and impressive MTBF. They operate over the full –40 to +75°C temperatu ...
... is a quick 200μsec, while output ripple and noise are typically 75mVp-p. These rugged modules are fully encapsulated with a thermally conductive potting compound that contributes to their outstanding moisture/vibration resistance and impressive MTBF. They operate over the full –40 to +75°C temperatu ...
(V).
... With very large resistance values, the maximum working voltage rating may be exceeded before the power rating is exceeded. For any resistor, the maximum voltage which produces the rated power dissipation is: Vmax = Prating × R Exceeding Vmax causes the resistor’s power dissipation to exceed it ...
... With very large resistance values, the maximum working voltage rating may be exceeded before the power rating is exceeded. For any resistor, the maximum voltage which produces the rated power dissipation is: Vmax = Prating × R Exceeding Vmax causes the resistor’s power dissipation to exceed it ...
living with the lab - Louisiana Tech University
... If you do not agree, then do not view this content. The copyright label, the Louisiana Tech logo, and the “living with the lab” identifier should not be removed from this presentation. You may modify this work for your own purposes as long as attribution is clearly provided. ...
... If you do not agree, then do not view this content. The copyright label, the Louisiana Tech logo, and the “living with the lab” identifier should not be removed from this presentation. You may modify this work for your own purposes as long as attribution is clearly provided. ...
Chapter 3: From lumped to distributed elements
... Quality factor Q = omega0*av. Energy stored/av. Energy dissipated Q = f0/3dB BW (relatively low due to losses in coil) High tolerance on resonant frequency At resonance: currents trough C and L cancel out and equal Q times the resistor current Piezo-acoustic resonators Quartz (SiO2) crystal High Q, ...
... Quality factor Q = omega0*av. Energy stored/av. Energy dissipated Q = f0/3dB BW (relatively low due to losses in coil) High tolerance on resonant frequency At resonance: currents trough C and L cancel out and equal Q times the resistor current Piezo-acoustic resonators Quartz (SiO2) crystal High Q, ...
Generated Voltage and Electromagnetic Torque
... K e? N ? Eam ? Vdc ? I am Rm The current is calculated from this equation. The output power and torque are: ...
... K e? N ? Eam ? Vdc ? I am Rm The current is calculated from this equation. The output power and torque are: ...
CHAPTER 3 ELEC REVIEW KEY
... __4____ Connect the test leads in parallel with the resistance to be measured. __2____ Place the range switch at the highest range. __6____ Again short the test leads to each other at the selected range and zero the meter for zero ohms. __1____ Place the function switch in the +DC position. __3____ ...
... __4____ Connect the test leads in parallel with the resistance to be measured. __2____ Place the range switch at the highest range. __6____ Again short the test leads to each other at the selected range and zero the meter for zero ohms. __1____ Place the function switch in the +DC position. __3____ ...
Switched-mode power supply
A switched-mode power supply (switching-mode power supply, switch-mode power supply, SMPS, or switcher) is an electronic power supply that incorporates a switching regulator to convert electrical power efficiently. Like other power supplies, an SMPS transfers power from a source, like mains power, to a load, such as a personal computer, while converting voltage and current characteristics. Unlike a linear power supply, the pass transistor of a switching-mode supply continually switches between low-dissipation, full-on and full-off states, and spends very little time in the high dissipation transitions, which minimizes wasted energy. Ideally, a switched-mode power supply dissipates no power. Voltage regulation is achieved by varying the ratio of on-to-off time. In contrast, a linear power supply regulates the output voltage by continually dissipating power in the pass transistor. This higher power conversion efficiency is an important advantage of a switched-mode power supply. Switched-mode power supplies may also be substantially smaller and lighter than a linear supply due to the smaller transformer size and weight.Switching regulators are used as replacements for linear regulators when higher efficiency, smaller size or lighter weight are required. They are, however, more complicated; their switching currents can cause electrical noise problems if not carefully suppressed, and simple designs may have a poor power factor.