My pc is plugged-in to an extension cord which is always turn-on because the internet modem is also plugged in to it and my roommates are nightshift and they need the internet connection for their work related transaction. I know it is kinda very amateur question to ask but I want to make sure it is safe and another reason is I don't want to keep unplugging my pc whenever I turn it off if keeping it all time plugged-in is generally safe.