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What is reactive power
This document discusses reactive power in electrical systems through an analogy of carrying water up ladders to fill a water tower. It explains that:
1) Reactive power, like carrying an empty bucket up and down a ladder, involves the transfer of energy without absorbing real power over a full cycle.
2) Having enough reactive power, represented by enough people carrying buckets, is necessary to transmit real power, represented by the water being carried, through a system.
3) Not having enough reactive power can lead to voltage collapse, where the voltage drops to zero, analogous to people becoming too tired to carry heavier buckets as more water is needed to be carried up the ladders.
Hrm10e ch01
This document discusses the strategic role of human resource management. It explains that HR managers must demonstrate how their plans will create value and further the company's strategy. The document outlines various metrics that HR managers can use to measure their department's performance, such as absence rate, cost per hire, and turnover rate. It emphasizes that measuring HR's contribution through metrics is crucial for today's HR managers.
Recommended
What is reactive power
This document discusses reactive power in electrical systems through an analogy of carrying water up ladders to fill a water tower. It explains that:
1) Reactive power, like carrying an empty bucket up and down a ladder, involves the transfer of energy without absorbing real power over a full cycle.
2) Having enough reactive power, represented by enough people carrying buckets, is necessary to transmit real power, represented by the water being carried, through a system.
3) Not having enough reactive power can lead to voltage collapse, where the voltage drops to zero, analogous to people becoming too tired to carry heavier buckets as more water is needed to be carried up the ladders.
Hrm10e ch01
This document discusses the strategic role of human resource management. It explains that HR managers must demonstrate how their plans will create value and further the company's strategy. The document outlines various metrics that HR managers can use to measure their department's performance, such as absence rate, cost per hire, and turnover rate. It emphasizes that measuring HR's contribution through metrics is crucial for today's HR managers.
Over head power lines
This document discusses transmission lines and overhead power lines. It describes different types of transmission lines like coaxial cable, microstrip, and twisted pair. It then covers overhead power lines, explaining that they transmit electricity over long distances using conductors like copper, steel, aluminum, and ACSR. The document also classifies overhead transmission lines by voltage and discusses conductor materials and their properties.
Cassandra
This document provides an overview of Cassandra, a decentralized, distributed database management system. It discusses why the author's company chose Cassandra over other options like HBase and MySQL for their real-time data needs. The document then covers Cassandra's data model, architecture, data partitioning, replication, and other key aspects like writes, reads, deletes, and compaction. It also notes some limitations of Cassandra and provides additional resource links.
Thermal power plant
Thermal power plants generate electricity by converting heat energy from combustion into mechanical energy using steam to power a turbine which drives an alternator. The document outlines the basic processes involved including:
- Fuel is combusted in a boiler to produce high pressure steam.
- The steam powers a turbine which converts the thermal energy to mechanical energy.
- An alternator converts the mechanical energy to electrical energy.
- The steam is then condensed in a condenser and recycled to the boiler through feedwater heating processes to improve efficiency.
Audio power amplifier
This document provides information about class-D audio power amplifiers, including:
1. Class-D amplifiers are switching amplifiers that use pulse-width modulation to drive output devices. This significantly reduces power losses and allows efficiencies as high as 90-95%.
2. Advantages of class-D amplifiers include reduced heatsink size, low voltage requirements, and high theoretical efficiency. Disadvantages include higher cost and greater EMC challenges due to the need for multiple inductors.
3. Proper PCB layout is important for audio quality and EMC performance. This includes using a ground plane, placing decoupling caps close to the IC, and properly locating EMC filters and inputs
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Over head power lines
This document discusses transmission lines and overhead power lines. It describes different types of transmission lines like coaxial cable, microstrip, and twisted pair. It then covers overhead power lines, explaining that they transmit electricity over long distances using conductors like copper, steel, aluminum, and ACSR. The document also classifies overhead transmission lines by voltage and discusses conductor materials and their properties.
Cassandra
This document provides an overview of Cassandra, a decentralized, distributed database management system. It discusses why the author's company chose Cassandra over other options like HBase and MySQL for their real-time data needs. The document then covers Cassandra's data model, architecture, data partitioning, replication, and other key aspects like writes, reads, deletes, and compaction. It also notes some limitations of Cassandra and provides additional resource links.
Thermal power plant
Thermal power plants generate electricity by converting heat energy from combustion into mechanical energy using steam to power a turbine which drives an alternator. The document outlines the basic processes involved including:
- Fuel is combusted in a boiler to produce high pressure steam.
- The steam powers a turbine which converts the thermal energy to mechanical energy.
- An alternator converts the mechanical energy to electrical energy.
- The steam is then condensed in a condenser and recycled to the boiler through feedwater heating processes to improve efficiency.
Audio power amplifier
This document provides information about class-D audio power amplifiers, including:
1. Class-D amplifiers are switching amplifiers that use pulse-width modulation to drive output devices. This significantly reduces power losses and allows efficiencies as high as 90-95%.
2. Advantages of class-D amplifiers include reduced heatsink size, low voltage requirements, and high theoretical efficiency. Disadvantages include higher cost and greater EMC challenges due to the need for multiple inductors.
3. Proper PCB layout is important for audio quality and EMC performance. This includes using a ground plane, placing decoupling caps close to the IC, and properly locating EMC filters and inputs
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Handboek operationele interne logistiek, hoofdstuk 7
Handboek operationele interne logistiek, hoofdstuk 7