No
The question is not clear, and if you are not clear about something it is not safe.
it is completely safe
If you mean can you plug in an ac adaptor to charge the laptop while the laptop is running, yes, you can. There is no harm to the laptop whatsoever.
The laptop runs on Direct Current (DC) electricity from an internal chargeable battery. Even when plugged into an Alternating Current (AC) electricity source from a mains power wall socket, the AC is changed to DC electronically inside the laptop.
yes you are right ! it's safe to your laptop .
A laptop runs on DC. Either from the battery, or the external power supply, which converts AC power to DC.
A battery on a laptop serves its purpose of allowing you to take your laptop with you away from external power sources (ex. ac outlet). They can also work like uninterruptable power supplies as if you have the laptop hooked up to an outlet yet the power goes out for a minute, your work is safe as the power will not shut off.
The laptop will turn off when it is unplugged from the AC adapter
Clean your AC adapter.If your laptop is old then there may be a problem with laptop's charger port contact your laptop provider.
Your laptop already contains "lead" in its circuits, sitting the laptop near (or directly on) lead will not effect its operation. Please note that lead and its residue can be a health risk so keeping the laptop (or the lead) wrapped to avoid direct contact, or indirect transfer, with your skin is advised.
What voltage is used in Dell Laptop AC Adapters depends on in which part of the world the laptop gets bought. Europe for example has a diffrent voltage then the USA.
the laptop turns off when unplugged from AC adapter