May 27 2011
Here are some basic SI units that you might want to use in your calculations….
|quantity||name||symbol||in terms of …|
|other units||base units|
|plane angle||radian||rad||m m−1|
|solid angle||steradian||sr||m2 m−2|
|force||newton||N||m kg s−2|
|pressure, stress||pascal||Pa||N/m2||m−1 kg s−2|
|energy, work, heat||joule||J||N m||m2 kg s−2|
|power, heat flow||watt||W||J/s||m2 kg s−3|
|electric charge||coulomb||C||s A|
|electric potential||volt||V||W/A||m2 kg s−3 A−1|
|capacitance||farad||F||C/V||m−2 kg−1 s4 A2|
|resistance||ohm||Ω||V/A||m2 kg s−3 A−2|
|conductance||siemens||S||A/V||m−2 kg−1 s3 A2|
|magnetic flux||weber||Wb||V s||m2 kg s−2 A−1|
|magnetic flux density||tesla||T||Wb/m2||kg s−2 A−1|
|inductance||henry||H||Wb/A||m2 kg s−2 A−2|
|celsius temperature||degree celsius||℃||K|
|luminous flux||lumen||lm||cd sr||m2 m−2 cd|
|absorbed dose||gray||Gy||J/kg||m2 s−2|
|equivalent dose||sievert||Sv||J/kg||m2 s−2|
|catalytic activity||katal||kat||s−1 mol|
Permanent link to this article: https://www.animatedscience.co.uk/2011/si-units
Permanent link to this article: https://www.animatedscience.co.uk/2011/unit-1-as-exam-past-papers
May 09 2011
For a copper wire (at a given temperature) the speed of the electrons depends only on the voltage across it. Imagine a three-lane road and a single-lane road with cars all going at the same speed. More cars pass per second in the wider road even though the speed is the same. More cars (charges) per second means higher current for a given voltage and so smaller resistance.
Since current is the same around a simple series circuit the charges have to go faster where the wire is thinner. Faster charges mean more interactions with the ionic lattice per second and so higher resistance.
Permanent link to this article: https://www.animatedscience.co.uk/2011/why-do-thick-wires-have-lower-resistance
Permanent link to this article: https://www.animatedscience.co.uk/2011/exam-past-papers-unit-5-5d
Mar 20 2011
Here are three examples of my own paintings as the first post in this area..
Spain – This is a thickly based acrylic painting which took an age to dry. It is currently in Spain as a gift to a Spanish friend of mine when he got married. It was designed to capture the vivid colour of spain with a Salvador Dali / Henri- Matisse twist.
Animal – This painting started off an a computer generated image in MS Paint on Windows 3.1. I liked it so much I painted it on board in primary acrylic colours. It is now my logo for the website and Animated Science!
Reflections – This painting was inspired by my techincal drawing lessons. I wanted to look at the idea of a refection of a shape which is subdivided. I used a board which my art teacher gave me which curved a lot in the end!
Permanent link to this article: https://www.animatedscience.co.uk/2011/my-paintings
Permanent link to this article: https://www.animatedscience.co.uk/2011/beginers-guide-to-sausage-making
Feb 22 2011
Permanent link to this article: https://www.animatedscience.co.uk/2011/cross-winds-calculations
Permanent link to this article: https://www.animatedscience.co.uk/2011/bowman-game