okay one last post before i
jyjy for EOYS!
well yesterday was the photo taking session, and it was very fun especially when ting
zhou and
Ryan carried
Eugene horizontally, i swear the pic is So GOING TO BE FUN!
Anyway, usual day, almost sleeping in
mr su's lesson, luckily, there
was sweets to accompany me =P
well, studied, so far i remember this for science,
Refraction- the bending of light when it passes from one medium to another medium of different optical
density. By the way,
Optical density is so not density.
Reflection- the
reflecting of light on a smooth or rough surface( diffused reflection) . The angle of
incidence and the angle of refection is always the
same, both rays lie on the same plane, and both rays have the same speed.
Dispersion- the dispersion of white light via a prism or water droplets to form into 7 colours. red, orange, yellow, green blue, indigo, violet. violet
being the ray that refracts the
most and red the least. red being the fastest and violet being the least.
Si unit for force is Newton.
Si unit for moment is Newton metre.
Moment of a force- the moment of a force is defined as the product of the force and the perpendicular distance from the line of action to the pivot.
the line of action is the direction the force is acting toward in a particular motion.
The moment of a force is therefore directly
proportional to the magnitude of the force applied and the perpendicular distance from the pivot.
Electricity-
Electricity is the amount of electrons flowing through a circuit.
There are three main component is electricity.
Current(I)
Resistance(ohm)
Potential difference(voltage)
Si unit for current is ampere and is measured
through a
ammeter.
Voltage is measure by a voltmeter
resistance, well
formulae!
parallel curcuit is measured in 1/R+1/R=1/R Total
in series it is just measured. a rheostat is a variable resistor.
okay!
Enough!
NOT
The resistance of an ammeter is ver low, and the voltmeter, very high
The formula of calculating resistance when the resistance is unknown is V/I
The following are the benifits of a parallel circuit,
- when one branch is broken in a parallel circuit, the current is still able to flow. there is also equal amount of current pasing through each branch.
- Used in household lightings.
In a series, the current is flowing through only one branch, hence, if it is broken, the whole circuit would be cut.
The filament of a light bulb, is made of tugnsten!=3
Reasons, it has a high melting pont, it has a high resistance, it is a conductor of electricity and it gives off a hot white light when the circuit is switched on.
the heating and magnetic and chemical effect are as follows.
The heating effect
- heat is produced when appliances that have heating elemnt eg, kettle, iron. would give off heat when turned on. Nichrome is usually used to make heating elements as it has a high melting point and a high resistance.
The chemical effect
- Electrolysis is conducted using the chemical effect by electricity.
in electrolysis, two carbon rods are placed connecting to each end of a electric circuit. each end is the placed in a beaker of water.
Electrolysis is the chemical decomposition of an electrolyte when electic current flows through it.
well, i could go on.......
and on..........
BUt it has to stop=P
well nice smelling you all! See yas. in October 23rd ++++++++)
woots Just got back from school man its so tiring that my back is aching. any ways some late pics in school when (JAMES wink-ink lol so fun name!) taught us! enjoy! OUr hero!
