《IGCSE science Chemistry study notes》Cycle test- electricity (unfinished)
Advertisement
unlike charges attract
like charges repel
Describe and interpret simple experiments to show the production and detection of electrostatic charges by friction
Inflate a balloon and rub it quickly on any dry surface e.g. a carpet. Then open a tap and hold the balloon next to it (without touching the water). You should see that the water bends towards the balloon!
Tear up a piece of paper into small bits. Then take a ruler, rub it on your hair and place them just above the bits of paper, without touching them. You should see the paper get attracted to the ruler.
This kind of attraction is called electrostatic attraction. This happens because of the charges on the materials.
- State that charging a body involves the addition or removal of electrons.
- Grounding is the process of removing the excess charge on an object by means of the transfer of electrons between it and another object of substantial size.
- Distinguish between electrical conductors and insulators and give typical examples
Conductors are materials in which current can flow. Examples: copper, aluminum, gold and silver.
Insulators cannot conduct electricity. Examples: glass, wood, paper, air and rubber.
- Current is the flow of charge (electrons) within a circuit.
- State that current in metals is due to a flow of electrons
- Resistance is directly proportional to length
- Resistance is inversely proportional to cross-sectional area
inversely proportional- the two quantities behave opposite in nature.
parallel circuit
- sum of currents in the separate branches = current from source
- total circuit resistance = 1/R1 + 1/R2 + 1/R3
- current from source > current in each branch
- the lower the resistance, the higher the current.
- combined resistance of two resistors
- voltage across all the components is the same in a parallel circuit
- I = Q / t
current = electric charge / time
amperes [A] = coulombs [C] / time [s]
- R = V / I
Resistance = voltage / current
Increasing the resistance will cause the current to decrease.
- I = P / V
current = electric power / potential difference
- E = IVt
energy = current x voltage x time
- Recall and use the fact that the sum of the p.d.s across the components in a series circuit is equal to the total p.d. across the supply
p.d. = resistance
- Calculate the combined resistance of two resistors in parallel
Advertisement
- In Serial10 Chapters
Anti-Martial Academy: PRiSMA Saga (LN)
{A crossover based on a Visual Novel still in the works called ‘PRiSMA’, and heavily inspired by the Light Novel called ‘Anti-Magic Academy’. Thus, the plot and events are reminiscent of the latter.} The denizens of the underworld, Anima and long forgotten Martial Artists of the Murim, both allied with each other to fight humanity. Their attacks almost caused the fledgling Magi to become extinct. When heroes appeared to fight off the invading forces, the ‘First World Ender War’ finally came to a conclusion. In the stalemate that followed, the new Magi went through a technological revolution. In the current era of peace, the Anti-Martial Academy was made to fight off those Martial Artists infiltrating the Earthland Domain. In the present, the ‘Red Queen’ was demoted back into the Academy. Forced to join the ‘Support Squad’, a team of outcasts who can’t fight even to save their lives, the one most uncomfortable became Fritz Lazrik, the leader that seemed too much like a pushover. Wielding a MagiPen in hand, he has the small hope of being able to beat the ‘monster’ joining them. The start of their legend begins...————I have posted this on other sites.
8 86 - In Serial15 Chapters
Distorted Light :TFALM
Lord Silvar of the Vampiric & Succubus province in the Demon-Coalition want's to learn all he can about the past and what started the great war between their coalition and the Light-Alliance. However, some spies returned with some dier news causing him to refocus on his duties. Silvar must overcome his tragic past and align himself with new allies, old enemies, and past friends to overcome the new war in the world. Can the usually quick-to-act Lord achieve his goals? While preventing a new war? Will darkness turn to light in this epic tale?
8 92 - In Serial581 Chapters
Star Eater
When a man finds himself in the presence of absolute power, what will he do? Dying has already happened, but he wasn't given permission and the creature responsible finds his tragedy amusing. Forcing him to continue his life in a new world, he is given an unknown task that must be completed if he ever wishes to rest.
8 370 - In Serial43 Chapters
The WORLD of Dungeons
""""DUNGEON CREATIONS"""" after of years playing this game, chris David a 24-year-old man having with out a job and always in his room playing the game. when the company announces that the game will shut down completely after it declares bankruptcy by the bank. he decided to stay in the game until the system will shutdown on its own, but after the allotted time, HE WAS STILL IN HIS THRONE ROOM, when he decided to log out. he opens the system but found out that the icon where the logged out is was not there anymorefind out what happen to him, as he finds the truth behind this event.PS. this story was inspired by the mystery of dungeon and overlord. you will see some similarities about its structure of dungeons, but I will try my very best to keep it as original as possible.
8 308 - In Serial3 Chapters
Kiribaku Oneshot
This is only still here because of the decent amount of reads.I am re-writing everything but the smut.
8 78 - In Serial38 Chapters
Not Anyone | Vernon Chwe
After a heartbreak, she, impulsively, went to a place hours of flight away from home, choosing to deny the pain for as long as her trip would take. Yet, when she decided to be single for an extensive amount of time, this one guy made her think of her decision again. He was nothing like her heartbreaker. He was fine, hot and was a total catch. In the process of her getting as far away from her new-fresh-ex, she found herself questioning about another guy. And when she thought that she was the only one who went there after a heartbreak, she wasn't the only one.
8 121
Prev Chap
Next Chap
Chap List
Boy
Girl
