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The study examined the effects of active and passive touch under conditions of cognitive load. It hypothesized that active touch would be more accurate than passive touch, and that cognitive load would decrease accuracy more for passive touch. Participants identified cookie cutter shapes using active or passive touch with or without a concurrent cognitive task. Results showed active touch was more accurate without load but less so with load, while passive touch accuracy increased under load. The findings suggest that when cognitive resources are limited, an additional task may not reduce accuracy further as there is insufficient capacity to process new information simultaneously.
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Three-phase systems have multiple voltages or currents that are displaced in time by 120 degrees. They provide advantages over single-phase systems like higher power capacity, self-starting motors, and more constant power output.
A 3-phase generator produces 3 voltages displaced by 120 degrees through its winding configuration. The voltages can be connected in either a star or delta configuration. In a star connection, the winding ends meet at a central neutral point. In a delta connection, the windings are connected in a closed loop.
Power in a 3-phase circuit can be measured using either 3 wattmeters connected to each phase, or 2 wattmeters connected across different phase combinations to calculate total power.
Practical setup of power electronics lab power semicondutor devices [ scr, m...
Some common power devices are the power diode, thyristor, power MOSFET, and IGBT. The power diode and power MOSFET operate on similar principles to their low-power counterparts, but are able to carry a larger amount of current and are typically able to support a larger reverse-bias voltage in the off-state.
Structural changes are often made in a power device in order to accommodate the higher current density, higher power dissipation, and/or higher reverse breakdown voltage. The vast majority of the discrete (i.e., non-integrated) power devices are built using a vertical structure, whereas small-signal devices employ a lateral structure. With the vertical structure, the current rating of the device is proportional to its area, and the voltage blocking capability is achieved in the height of the die. With this structure, one of the connections of the device is located on the bottom of the semiconductor die.
Current Source Inverter and Voltage Source Inverter
The document discusses two types of inverters - current source inverters (CSI) and voltage source inverters (VSI). It describes the construction and working of CSI, which uses predetermined source current and load impedance to determine output voltage. VSI uses a constant DC input voltage and feedback diodes. The document also covers applications of CSI and VSI, such as use of CSI for AC motor drives due to regenerative capability, and use of VSI in UPS and AC drives. FACTS devices based on VSI are also summarized, including STATCOM, SSSC and UPFC for controlling transmission line parameters.
Ajal UPQC
UPQC a novel method to efficiently utilize Sustainable / Alternate Energy Sources is a presentation about power quality issues and solutions. It discusses different power quality problems such as voltage sags, swells, harmonics, and reactive power issues. It then introduces several custom power devices that can address these problems including the STATCOM, DVR, and UPQC. The UPQC is described as an active series-shunt power line conditioner that can compensate for various power quality issues such as voltage sags/swells, imbalance, flicker, and harmonics. The presentation concludes by discussing future trends in power semiconductor switches and the balanced application of these new technologies.
Passive filters
This document discusses passive filters, which are composed only of passive components like resistors, capacitors, and inductors. There are four basic types of passive filters: low-pass filters, which pass frequencies below a cutoff frequency; high-pass filters, which pass frequencies above a cutoff frequency; bandpass filters, which pass a narrow range of frequencies between upper and lower cutoff frequencies; and band-reject filters, which reject a narrow range of frequencies but pass others. The document provides examples of RC and RL low-pass and high-pass filter circuits and discusses how their frequency response depends on the component values.
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single phase to three phase converter by using digital converter in which we firstly convert single phase AC input to DC by using Rectifier and then again convert this DC into Three Phase Ac by using 3-Phase Inverter
Active filters
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Current Source Inverter and Voltage Source Inverter
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Powerpoint Rm
- 1. The Relationship between Active Touch and Passive Touch in the Presence of Cognitive Load