I simply do a search on the web for the component an copy the image.
A lot of times I find the image on a site selling the item. Sometimes I select images in the google search or duckduckgo search to find what I want
I always try to find an image with a pure white background.
I have three different ways to copy the image once I find it.
1) Right click on the image and there is usually a 'copy image' or 'save image' selection.
2) My favorite way to grab the image is to use the windows snipping tool (It ships with windows). It allows you to copy a section of your screen. I then just past it into the app I am using.
3) The 3rd method is to do a screen shot. In windows, press the windows key and the prtScr key and it will put an image of the screen into the screenshot folder in your pictures folder. (I rarely use this method)
Edit Changed ms pain to MS Paint below (Was that a Froidian slip?)
Sometimes the images I find need cropping or things blanked out. I don't have photoshop so I will put it into powerpoint and then use white boxes to cover stuff I need blanked out. I then use the Windows snipping tool to get a copy of the modified image. In a few cases I have had to use MS Paint to modify the image but that is a real PITA.