If by power bar you mean.
Then, Yes you can.
Make sure to wire up your plug correctly and properly. If it did not come originally with a plug then check if the wires are sat firmly within the plug.
As per you comment. It is possibly true for cheap power blocks with no
certification or valuation, so don't use cheap ones for lots of
things. If you are paying a premium price for a power block with
surge protection and marked as 1800Watt then you can be pretty sure it
passes all tests to handle this wattage. (beware of fakes)
For the second part, Yes you can also plug all your other appliances into the power bar.
You just have to make sure that the total combined wattage does not get excessive. As a guideline I would say stay under 1000watt constant usage.
The 1800watt means the power bar can handle a maximum of 1800watt but it does not mean you should push it to that limit.