## Physics – Dimensions of Physical Quantities

The dimensions of a physical quantity describe the nature of that physical quantity. What is meant by “nature” is that for example length and mass are two different physical quantities, not of the same type or “nature”. You already intuitively know that you cannot add a mass to a length. An expression like “2 kg + 5 m” would make no sense and cannot be evaluated. In this article, we will understand the concept of dimensions of a physical quantity. We’ll also talk about the applications of those dimensions in physics. To explore this topic or physics in general more in depth, please refer to the last section of this article, where you will be provided with a course link.  Continue reading “Physics – Dimensions of Physical Quantities”

## Mean Absolute Error, Relative Error and Percentage Error

This article talks about reporting the result of measurements in the form of numbers correctly and reliably. In case you find the article not detailed enough, you can refer to the last section. You’ll be provided with a course link where you will have more detailed information about the contents of this article.  Continue reading “Mean Absolute Error, Relative Error and Percentage Error”

## Rules to Determine Combination of Errors in Calculation Results

This article talks about calculating the combination of errors in calculation results. As an example, suppose you measure two physical quantities. Since in every measurement, there is some uncertainty or error that cannot be prevented, we need to come up with appropriate algebraic ways to calculate them and exclude them from our calculation results otherwise the error in measurement keeps repeating itself in calculation over and over again, possibly getting larger and larger depending on your algebraic operations and ultimately creating trouble in whatever system is made base off of those measurements and calculations.  Continue reading “Rules to Determine Combination of Errors in Calculation Results”

## Rules for Rounding Numbers

Rounding numbers occur in two different situation. Either you round a number to a certain number of decimal places or to a certain number of significant figures. In this article we’ll learn how to round number.  Continue reading “Rules for Rounding Numbers”

## Rule for Arithmetic Operations with Significant Figures

Doing arithmetic on significant figures becomes important in cases where you use numbers with a certain number of significant figures in mathematical operations involving multiplication, division, addition or subtraction. Let us take the following examples.  Continue reading “Rule for Arithmetic Operations with Significant Figures”

## Capacitors Pass AC and Block DC

You know that an AC signal is continuously changing in magnitude and direction (polarity), meaning that the magnitude of the voltage is moving from zero to peak many times in a second depending on the frequency. Also, the direction (polarity) of the voltage is changing periodically as well. Meaning that, in a complete cycle, an AC wave is positive half of the time and negative half of the time.  Continue reading “Capacitors Pass AC and Block DC”

## Number of Significant Figures

Significant Figures indicate the precision of a measurement which depends on the least count of the measurement device. Least count is another name for the highest resolution the measurement device can offer in the measurement.  Continue reading “Number of Significant Figures”

## Infinite Limits Definitions

For the limit of a function at some point “a” in the domain of the function to exist, “a” must be included in the domain of the function but it’s possible that the function is not defined at x=a specifically, meaning that if the function is not defined at x=a but “a” is within the domain of definition of the function, the limit of the function at x=a might exist.  Continue reading “Infinite Limits Definitions”

## Physical/Chemical Properties and Changes

The characteristics that distinguish one substance from another are called “properties.”

One way to classify properties is based on whether or not the chemical composition of an object is changed by the act of observing that property.  Continue reading “Physical/Chemical Properties and Changes”