# Fysik 1 (19 posts)

## How to choose your decoupling capacitor

What is a capacitor A capacitor is an passive device that stores electrical energy in an electrical field. In layman terms it is a reservoir for energy the same way a rechargeable battery is, although it has many other properties…

## Simple electret microphone circuit

What is an electret microphone One of the most common microphone component that is used in the today's devices (eg. smartphone) is the electret microphone. The electret capsule contains, among other little details, an electret diaphragm and a JFET transistor…

## Full wave rectifier

One important part of electronics is converting the alternate current (AC) - the form of current delivered to our homes and offices - into a useful direct current (DC). Although I am just a newbie in this field, rather a…

## Trailer light tester - DIY

Continuing my last post on how I fixed a faulty AFC trailer converter I thought it might be useful sharing my thoughts about how I built a trailer light tester for one buck or less. So this is rather a…

## Trailer AFC converter turn signals blink together

In case you are willing to wire yourself the trailer to your car and you notice that your trailer AFC converter turn signals blink together you should at first follow the steps mentioned here. But what if the problem is…

## Differential equations: estimating the time of death

For those who still haven't found the usefulness/beauty of math (and in particular calculus) I propose a small real-life application inspired by a CSI episode: estimating the time of death. The problem Let's suppose that you are a crime investigator…

## Relativitetsteori och standardmodel

Relativitetsteori I 1861 lyckades James Clerk Maxwell sammanfatta allt man visste om elektricitet och magnetism i några matematiska ekvationer som visade att elektricitet och magnetism inte var två separata fenomen utan olika sidor av elektromagnetism. På den här tiden tänkte…

## Kärnfysik

Atomkärnan År 1911 upptäckte Rutherford atomkärnan. Atomkärnan är uppbyggd av protoner (upptäckt av Rutherfor i 1920, är positiv laddad partikel) och neutroner (upptäckt av James Chadwick 1932, är neutralt laddad partikel). Protoner och neutroner har fått det gemensamma namnet nukleoner.…

## Den moderna fysikens utveckling

Atomens historia Atoms etymologi (grekiska): a=ej, tomos=delbar => atom=odelbar som i "odelbar partikel". Omkring år 450 f.Kr. hävdade Demokristos (460-370 f.Kr.) att allt i världen egentligen består av atomer och tomrum. Tyvärr övertygade han inte majoriteten i Grekland om sina…