Overview
Direct current is a flow of electric charge in only one direction and has a steady state of constant voltage in the circuit. Rectifiers, batteries, commutator-equipped generators, and fuel cells are some examples of devices that generate direct current. Nowadays, most applications use a time-varying voltage source. Alternating current is a flow of electric charge that periodically reverses direction. An alternating current is produced by an alternating emf that is generated in a power plant. If the alternating current source varies periodically, particularly sinusoidally, the circuit is known as an alternating current circuit. Some electrical devices, such as fans, bulbs, air conditioners, and motors, run on alternating current. Different alternating current voltages and frequencies are used in homes, offices, and other places around the world. The potential difference between two electrical outlets in a typical home alternates sinusoidally with a frequency of 60 Hz or 50 Hz and an amplitude of 156 V or 311 V depending on whether you live in the United States or Europe, respectively. The electrical outlets in the US and Europe have a potential difference of 120 V or 220 V, respectively. However, these voltages are the typical voltages in the outlets, not the peak values. When a resistor is connected to an alternating current voltage source, the voltage and current vary in time across the resistor. The voltage fluctuates sinusoidally with time at a fixed frequency on either…
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Embed code vs URL
An embed code allows you to place a JoVE video directly inside of your learning or training environment. Most learning management systems such as Canvas, Blackboard, and Moodle require an embed code for JoVE content to stream.
A URL allows you to place a link in programs such as PowerPoint or Microsoft Word which takes a user to a separate page where they can watch a JoVE video.
Most of the time, you will want to use the embed code. However, there are some environments that don’t support embed codes such as Google Classrooms and MS Teams. In those instances, you can use a URL to still provide access to JoVE videos.
What is an Embed Code?
Basically, it’s a snippet of code that you put on your website that displays as a video. An embed code pulls the video from the original source, allowing you to display a video without having to host the file on your website.
How to embed a video
STEP 1: COPY YOUR EMBED CODE
To generate the embed code, simply click the Copy button above. You can customize it by choosing a specific language for the video, or setting exact dimensions for the video player.
STEP 2: PASTE THE EMBED CODE INTO YOUR ENVIRONMENT
Embed codes can be used in most learning management systems (Canvas, Blackboard, Moodle…), organizational websites, and a host of other tools. The specifics of how to add in an embed code will depend on your environment.
Generally, it involves accessing a text editor, entering the HTML mode on the editor, and pasting in the embed code. Get more details on embedding into specific environments here.