No.
You can't just "add" watts, electrics just don't work that way.
For a resistive load, you can get more watts by increasing the voltage, which'll increase the current flow. And as volts times amps = watts, that would sort of work. Trouble is, most stuff is only rated for a certain volts/amps range. Go outsisde this, and thigns are prone to overload, overheat, and plain and simple fail.
By stirring, heating, or adding more water :)
Adding more acid to a solution the concentration increase.
it will be increase until overloading point. then it will remain firm.
you can increase the amount of kinetic energy by increasing the mass and the velocity..
In general, steam is water so you're adding water to the air and raising the humidity. The small caveat is that steam is also going to heat the air, so it can hold more moisture. By adding moisture you increase the numerator of the relative humidity term, and by raising the heat you increase the denominator. In the end, the moisture would win and the relative humidity would increase.
By adding more light bulbs
It will decrease the effective load resistance across the power supply terminals, increase the total current through the load, and increase the total power required to be supplied by the power supply.
If you add more cells in series with the bulbs, the current will increase as the voltage across the bulbs increases. If you add more cells in parallel with the bulbs, the current will stay the same because the voltage of the cells does not increase when they are added in parallel.
All of the bulbs will become dimmer as more bulbs are added.
amps
adding more RAM
By stirring, heating, or adding more water :)
more gas If you increase the volume without adding more gas, the pressure decreases.
By adding more water or sloping the land.
metal is compressed by adding more, thus weight increase
The solution become more and more alkaline and the pH increase.
the voltage across each is the same