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    • 방장 : 미르나래
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    • 도서수준 : 고전 & 과학

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[18]Electricity and Magnetism 5차 미션

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등록일 2013-10-11 00:27

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Q1. Why are the circuits in buildings and homes made into a parallel circuit?

 

 

 

Q2. Why do wires with high resistance heat up?

 

 

To be answered by 10/20 after reading chap2.2(51~56p)


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annie0717 2013-10-28 00:36 
1. First of all, there is more than one path on which the charge may glow. All the elements don't have to be in working order for the circuit to function, unlike series circuits. The bulbs(or electronic devices) are all seperately connected to the same voltage source so that even if one bulb does not work, it doesn't cause any harm to the other working bulbs. Second, the brightness of the bulbs(or the functioning of the electronic devices) does not change. In a series circuit, the more bulbs you add, the dimmer they get. However, in a parallel circuit, the bulbs always glow their brightest. This is why the circuits in buildings and homes are made into a parallel circuit.
2. Imagine that you are standing in a room packed with people. Statues are scattered all over the place. You keep getting jostled and bumping into other people and statues. Now imagine a room with almost no one inside and with very few statues. You can move freely without stepping on another person's foot or smacking face first every time you take a step. Say that the room is a p***e of wire, the people are electrons, and the statues are atomic nuclei. Resistance occurs when electrons bump into atomic nuclei, thus slowing their flow. The first example represents a wire with high resistance. The electrons keep bumping into atomic nuclei. This creates friction, friction creates energy, and energy creates heat. Naturally, this wire begins heating up. The second example represents a wire with low resistance. The electrons seldom bump into atomic nuclei and are able to progress freely. In this case, there is less friction, less energy, and less heat. In conclusion, it is normal for wires with high resistance to heat up quickly than other wires.
Erin37 2013-10-27 17:13 

1. So that even if one path is down as isn't working, the other paths will keep on working. That is crucial to buildings, and it will prevent a blackout. But in a series circuit if one path is down, there will be a blackout.

2. Beause the wires have high resistance, and if they have high resistance, the more the resistance the more the heat. It will increase in a direct porpotional way.

directioner 2013-10-20 23:35 

A1. When we use parallel circuits instead of series circuits, than we have more than one path on which the charge may flow. So, if one bulb burns out, unlike the series circuits, the other bulb will continue to glow. Of course, there is a disadvantage in paralle circuits, too. The light of a bulb is much dimmer in parallel circuits than in series circuits. But, the circuits in building and homes are usually made into a parallel circuit, so even if one bulb, or electrical devide is switched off, the other devices can still be used.

A2. A heating element is a coil of wire in which produces heat by  an electric current. The heating element is made up of a type of wire that has a very high resistance. Generally, as the temperature gets hotter, the resistance gets higher too.

빛나는지 2013-10-12 20:40 

1. There are two reasons that people use parallel circuits instead of series circuits in buildings and  homes. The first reason is that if people use series circuits, and switch off one object, the rest of the electrical devices that is connected will be switched off, too, because there is only one path and the path is cut off. Meanwhile, if we use a parallel circuit, we can use the rest of the electrical devices even though we turn off one. The second reason is that as we add more electrical devices to a series circuit, the less current is available to a device. But because each device we add in a parallel circuit has its own branch to the power source, the devices work to their fullest.

2. I think it is because if there is high resistance in a wire, the electrons that are supposed to move among the atoms will hit the atoms with immense speed and produce heat energy due to friction. High resistance means more obstacles, leading to more collisions and more heat energy. For example, copper has low resistance, so is often used  in wires that need high speed and less heat energy, but iron, which has higher resistance than copper, is often used in things such as toasters, which need to transfer electricity into heat energy.


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