Hair erector muscles contract, causing the hairs to stand.This helps to trap a layer of air which can reduce heat lossas air is an insulator of heat(b)Negative feedback is1. A change in level / of set point/ in norm triggers lcauses ya response / reaction / sequence of events ;2....
Another common measurement you'll see is called the U-value, which is the total amount of heat lost through a certain thickness of insulating material. The lower the U-value, the lower the heat flow and the better the material does it job as an insulator (so that's the opposite of R...
Leaving aside vehicles and considering lithium-ion batteries more generally, what are the problems? The biggest issue is safety: Li-ion batteries will catch fire if they're overcharged or if an internal malfunction causes a short circuit; in both cases, the batteries heat up in what's called...
aYou could not imagine a more disturbing sight than what we looked like when arriving in Timor over forty days after being set loose in our small boat. Our clothes were torn, we had fever and our faces showed the hardships we had suffered. But after a rest, some good meals and some ne...
Can an insulator be charged? Explain. Give a proper definition of charge. What are 2 examples of charge transference on different objects? Explain the Faraday's law of induction. Explain how rubbing two objects together causes them to have equal and opposite charges. ...
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In other words, what substances are good conductors? Does convection occur in solids? Explain why or why not. Give THREE examples each of conduction, radiation, and convection. Conduction: Convection: Radiation: An insulator is something that prevents or slows the transfer of heat. List THREE i...
Discuss how pig iron is refined to form steel. How can you know when a molecule is a semi-insulator? Is it only metalloids? Explain. Explain how a voltaic cell works. Be sure to mention the various parts of the voltaic cell and what they have to do with how it works....
The main function of a PN junction diode is to allow the flow of current in one direction only. Hence for forwarding current, a diode should act as a conductor and for reverse current, it should act as an insulator. So if we choose a diode of the wrong PIV rating, our...
Clean the insulator tip and electrodes of the plug carefully. Check and set the electrode gap between 0.70 to 0.80 mm. Gap 0.70 to 0.80 INSPECTION OF TYRES AND WHEELS Inspect the tyres periodically for tread wear, cracks and cuts. Minimum tread depth : Front tyre : 1mm ...