A-Level Physics Support Sessions for Paper 2 and Paper 3A are going ahead! Also, another calculator gets added to my collection. See the blog post for more!
Category Archives: Calculators
Using Reverse Polish Notation
I’ve just recorded a video where I demonstrate the advantages of using Reverse Polish Notation (RPN) input logic when calculating quantities for electrical components: it’s quicker, there are fewer key presses and there is less chance of making a mistake. See blog post
The unboxing of my new HP 15c Collector’s Edition calculator
Happy Valentine’s day to me! I treated myself to a calculator I’ve wanted for many years, a HP 15c (well, the collector’s edition version. I cannot justify the price tag of the original) Screenshot from eBay, comparing the price of an original HP15c with an HP15c Limited Edition, 2024-02-14 20:20 Below I have embedded myContinueContinue reading “The unboxing of my new HP 15c Collector’s Edition calculator”
Issues with Casio calculators
Why do I dislike Casio calculators? Watch this video for a few of the reasons!
Looking inside the HP 9820A calculator
I was very kindly and generously gifted a Hewlett-Packard HP 9820A calculator by a good friend and ex-colleague. Unfortunately, the thing does not work, but I will try to get it working when I find the time between other things I have to do. The HP 9820A was the world’s first calculator that used anContinueContinue reading “Looking inside the HP 9820A calculator”
Fun with Op Amps
One can see the same potential applied to both inputs of the op amp, causing 0V output potential. That made sense. When connecting the inverting input pin to half the potential of the output (using two 10 kΩ fixed resistors as a potential divider), the output potential became 10V. Well, half of 10V is 5V, so that would make the inverting input potential 5V, the same as in the first case, yet the output potential is different.
Physics with Keith 