Ενότητα 9: Electric Meters
... Electric Meters are instruments for measuring and indicating magnitudes of electrical values, such as current, charge, potential, and power, and the electrical characteristics of circuits, such as resistance, capacitance, and inductance. The information is usually presented in terms of defined, stan ...
... Electric Meters are instruments for measuring and indicating magnitudes of electrical values, such as current, charge, potential, and power, and the electrical characteristics of circuits, such as resistance, capacitance, and inductance. The information is usually presented in terms of defined, stan ...
How LEDs work
... The power, or wattage of a device can be found by multiplying the electrical voltage and current, measured as volts and amps. Conversely we can find the current that flows through a lamp of a certain wattage by dividing the power by the voltage or find the voltage by dividing the power by the curren ...
... The power, or wattage of a device can be found by multiplying the electrical voltage and current, measured as volts and amps. Conversely we can find the current that flows through a lamp of a certain wattage by dividing the power by the voltage or find the voltage by dividing the power by the curren ...
ACS Control with opto-Triac
... current when the voltage across the Triac, just before turn-on, is positive, and by a negative current in the reverse situation. Such a solution works for all Triacs. The Triac is then triggered in what is called Q1 and Q3 quadrants. For ACS devices, as they can only be triggered by a negative curre ...
... current when the voltage across the Triac, just before turn-on, is positive, and by a negative current in the reverse situation. Such a solution works for all Triacs. The Triac is then triggered in what is called Q1 and Q3 quadrants. For ACS devices, as they can only be triggered by a negative curre ...
International Electrical Engineering Journal (IEEJ) Vol. 6 (2015) No.6, pp. 1917-1924
... harmonics produced by one rectifier can be cancelled by other rectifiers [8]. Thus, in practical situation, multi pulse transformers al-ways accompanied to provide the phase-shifted power supplies for the multiple rectifiers. Also in [8], multi pulse transformers with different configurations were i ...
... harmonics produced by one rectifier can be cancelled by other rectifiers [8]. Thus, in practical situation, multi pulse transformers al-ways accompanied to provide the phase-shifted power supplies for the multiple rectifiers. Also in [8], multi pulse transformers with different configurations were i ...
CMOS Differential Amplifier with Active Load: CMRR and Mismatch
... coefficients of both VBE and R. high current gain, Widlar source also achieves similar supply independence of output current. ...
... coefficients of both VBE and R. high current gain, Widlar source also achieves similar supply independence of output current. ...
Single-ended triode Amplifier using zero
... • I built receivers and transmitters (AM) by myself using 42,807,6146,829B and 4D32 • Soon advanced to SSB era, built SSB generators and linear amps with such as 811A,813 and 4-1000A • Still active on Ham radio, however all of my present gears are commercially made ones, but in all semiconductors • ...
... • I built receivers and transmitters (AM) by myself using 42,807,6146,829B and 4D32 • Soon advanced to SSB era, built SSB generators and linear amps with such as 811A,813 and 4-1000A • Still active on Ham radio, however all of my present gears are commercially made ones, but in all semiconductors • ...
Compensating for Varying Material Conditions in Resistance Welding
... constant voltage feedback modes are limited in their ability to cope with varying levels of plating and oxides. When constant current is used on heavily oxidized parts, the power supply ramps the voltage to very high levels in order to achieve the initial current flow. The rapid input of current, al ...
... constant voltage feedback modes are limited in their ability to cope with varying levels of plating and oxides. When constant current is used on heavily oxidized parts, the power supply ramps the voltage to very high levels in order to achieve the initial current flow. The rapid input of current, al ...
electric lineman protection using user changeable password based
... DIODES: Diodes are used to convert AC into DC these are used as half wave rectifier or full wave rectifier. When used in its most common application, for conversion of an alternating current (AC) input into a direct current (DC) output, it is known as a bridge rectifier. A bridge rectifier provides ...
... DIODES: Diodes are used to convert AC into DC these are used as half wave rectifier or full wave rectifier. When used in its most common application, for conversion of an alternating current (AC) input into a direct current (DC) output, it is known as a bridge rectifier. A bridge rectifier provides ...
Overload Currents
... protection, safety, and freedom from fire hazards that has made the fuse a widely used protective device. ...
... protection, safety, and freedom from fire hazards that has made the fuse a widely used protective device. ...
lab sheet - Faculty of Engineering
... 2. Adjust the sending-end voltage E1 to 300 V and keep it constant for the reminder part of the experiment. Use a three-phase resistive load and increase the load in steps making sure that the loads are balanced. Take readings of sending end and receiving end voltages and powers, E1, Q1, P1, E2, Q2, ...
... 2. Adjust the sending-end voltage E1 to 300 V and keep it constant for the reminder part of the experiment. Use a three-phase resistive load and increase the load in steps making sure that the loads are balanced. Take readings of sending end and receiving end voltages and powers, E1, Q1, P1, E2, Q2, ...
PTD1 - Faculty of Engineering
... 2. Adjust the sending-end voltage E1 to 300 V and keep it constant for the reminder part of the experiment. Use a three-phase resistive load and increase the load in steps making sure that the loads are balanced. Take readings of sending end and receiving end voltages and powers, E1, Q1, P1, E2, Q2, ...
... 2. Adjust the sending-end voltage E1 to 300 V and keep it constant for the reminder part of the experiment. Use a three-phase resistive load and increase the load in steps making sure that the loads are balanced. Take readings of sending end and receiving end voltages and powers, E1, Q1, P1, E2, Q2, ...
Atmel AVR-based Constant Current Supply
... 10 Amps and scaling in the circuit would be as follows: (10 Amps)(0.05_)(6) = 3.0 volts = reference voltage 1 volt = 3.33 Amps 1 bit = 3.0 volts/255 = 0.0118 volts per bit or 0.039 Amps per bit. The Atmel ATtiny15L AVR microcontroller was selected for this project because of its small footprint, int ...
... 10 Amps and scaling in the circuit would be as follows: (10 Amps)(0.05_)(6) = 3.0 volts = reference voltage 1 volt = 3.33 Amps 1 bit = 3.0 volts/255 = 0.0118 volts per bit or 0.039 Amps per bit. The Atmel ATtiny15L AVR microcontroller was selected for this project because of its small footprint, int ...
A. Power from wind turbine
... by harmonic mitigation. The three-phase boost type PWM rectifier has the capability of to work as an ideal PFC, with very low THD at any operation point. Hence, it is investigated in this work. The converter topology has six two-quadrant controlled switches each one implemented by an IGBT associated ...
... by harmonic mitigation. The three-phase boost type PWM rectifier has the capability of to work as an ideal PFC, with very low THD at any operation point. Hence, it is investigated in this work. The converter topology has six two-quadrant controlled switches each one implemented by an IGBT associated ...
Q-Astec - First transient power converter using switched
... Currents are switched to the load or to the return path Parallel switching Current Paths are utilized Transient can be supported in the time that it takes to turn the FET On/Off When output current follows processor demand current, significant reduction in output capacitance can be observed ...
... Currents are switched to the load or to the return path Parallel switching Current Paths are utilized Transient can be supported in the time that it takes to turn the FET On/Off When output current follows processor demand current, significant reduction in output capacitance can be observed ...
Parallel Circuits
... A parallel circuit can be constructed by connecting light bulbs in such a manner that there are SEVERAL PATHS for charge flow (CURRENT); the light bulbs are placed within a separate branch line, and a charge moving through the circuit will pass through only one of the branches during its path back t ...
... A parallel circuit can be constructed by connecting light bulbs in such a manner that there are SEVERAL PATHS for charge flow (CURRENT); the light bulbs are placed within a separate branch line, and a charge moving through the circuit will pass through only one of the branches during its path back t ...
Mercury-arc valve
A mercury-arc valve or mercury-vapor rectifier or (UK) mercury-arc rectifier is a type of electrical rectifier used for converting high-voltage or high-current alternating current (AC) into direct current (DC). It is a type of cold cathode gas-filled tube, but is unusual in that the cathode, instead of being solid, is made from a pool of liquid mercury and is therefore self-restoring. As a result, mercury-arc valves were much more rugged, long-lasting and could carry much higher currents than most other types of gas discharge tube.Invented in 1902 by Peter Cooper Hewitt, mercury-arc rectifiers were used to provide power for industrial motors, electric railways, streetcars, and electric locomotives, as well as for radio transmitters and for high-voltage direct current (HVDC) power transmission. They were the primary method of high power rectification before the advent of semiconductor rectifiers, such as diodes, thyristors and gate turn-off thyristors (GTOs) in the 1970s.