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Why do you have relays?
to control a high-current circuit with a low-current signal for example a starter on a car uses a very high current (not voltage) and needs thick cable to provide it.it would be impractical to run this thick cable up to the ignition key so a lower current from the starter key operates a switch, usually electro magnet, which in turn completes a circuit for the higher current.
Which type of transformers are used during power transmission from generation station and why?
Step up Transformers. To transport the electricity from the power generating plant over long distances you step up the voltage using transformers to reduce line / cable losses. When you step up the voltage at the same time you lower the current for the same power. The line loss is due in major part to the cables resistance, more current the more heat generated and lost in the cable itself. It's all basic OHMS law.
Which transformer raises the voltage high and lower the current for transmission?
A step-up transformer.
How long for a cable to heat up at maximum current rating?
It depends on the surround material, temperature, type of cable, and what you mean by "maximum current rating". Typically a maximum load current rating will be specified, such as 15A; this means you can push 15A through that cable nonstop without damaging it (it won't overheat). You might have a short time rating as well, such as a 4 hour rating, where the cable can handle runing 22A for 4 hours if the surrounding temperature is kept to some value, though this may slightly degrade the insulation. There's also a fusing current rating for many cables. At this current, the cable will eventually melt (like a fuse).
Differentiate step-up transformers from step-down transformers?
Step up transformers increase the voltage, while step down transformers reduce it. Higher voltages are better for electricity transmission/distribution, because, for any given load, the higher the voltage, the lower the resulting current. This means the supply conductors can have a lower cross-sectional area and the resulting saving in copper makes the installation cheaper. A lower load current also means lower line (energy) losses.
How do you replace window cable on a 2000 Chevrolet silverado pick up truck drivers side?
The cable runs through and is coiled inside the motor. It is advised to replace as an assembly.
What is formed with coiled up DNA?
Coiled up DNA, combined with protein histone, forms chromosomes.
Why do you have relays?
to control a high-current circuit with a low-current signal for example a starter on a car uses a very high current (not voltage) and needs thick cable to provide it.it would be impractical to run this thick cable up to the ignition key so a lower current from the starter key operates a switch, usually electro magnet, which in turn completes a circuit for the higher current.
How do you open rear cargo doors with cable broke?
Take the inside panel off and pull up on the lower cable and down on the upper cable.
What Is Coiled Up Chromatin?
Chromosomes.
How can power losses in long distance transmission be reduce by using transformers?
Over long distances cable loss happens because of the cable's resistance, The more current you create, the more heat generated and lost in the cable itself. It's all basic OHMS law. Thus to transport the electricity from the power generating plant over a national grid (over long distances), you reduce the current by stepping up the voltage using step up Transformers. When you step up the voltage, at the same time you lower the current for the same power. This reduces the line losses caused by the cables resistance. Obviously at the far end of the power transmission cable you need to use a step down transformer to bring the voltage down to the national domestic standard.
What is DNA coiled up into thread like structures called?
When DNA is in its coiled up form, it is called a chromosome. These exist in the nucleus of each cell.
How many double helical twists does a DNA have?
Your entire genome is coiled into a double helixes and these are intern coiled up further.
What is the difference between an electric cooker cable and a bulb cable?
The electric cooker cable is made thicker because it has to carry more current. If it were too thin it would heat up and perhaps melt.
What is made up of DNA coiled around proteins?
Chromatin.
Which type of transformers are used during power transmission from generation station and why?
Step up Transformers. To transport the electricity from the power generating plant over long distances you step up the voltage using transformers to reduce line / cable losses. When you step up the voltage at the same time you lower the current for the same power. The line loss is due in major part to the cables resistance, more current the more heat generated and lost in the cable itself. It's all basic OHMS law.
Which transformer raises the voltage high and lower the current for transmission?
A step-up transformer.
