Why doesn't Wi-Fi work if ethernet plugged in to router?

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25 Feb 2016
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Our internet was down for a few days recently. I have a wireless usb receiver that plugged in and used my phone hotspot for a few days.

What I noticed was that with the network cable still plugged into the router my PC had no internet. As soon as I removed the cable the internet worked.

This was a bit annoying as I have wireless printer.

Is there a way to have PC wired to router, but when the internet is not working it defaults to wireless connection? Or would I have to just wireless connect to router and get rid of the network cable for this to work?
 
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