brighter headlights
Yes, if the bulb is incandescent, and you change from a higher wattage bulb to a 25 watt bulb the future growth will be smaller.
It is possible for 1999-2000 headlight sockets to melt, especially when owners attempt to use higher wattage bulbs. They can be replaced by searching for "H4 wiring harnesses", which cost about $4 USD each.
Higher the frequency, higher the losses.
the higher the wattage is the hotter it gets
You should not use a higher wattage bulb in a lamp that says 40 watts. The higher wattage could cause the lamp to catch fire due to the excess heat and could cause you serious electrical problems.
No. All light from light bulbs (incandescent) are equally bright. Higher wattage bulbs simply produce a higher quantity of light measured in lumens.
lower wattage bulb
Check the wattage of the device that plugs into the adapter. If the device's wattage is lower that 25 watts then the answer is yes. If the device's wattage is higher that 25 watts then the answer is no.
When the frequency of the vibrations that produce the sound change. Higher frequencies -> higher pitch. OR if the source of the sound is moving towards or away from you -> Doppler effect.
They are all equally good, the only difference is in the wattage. If you need more sound, then go with a higher wattage speaker.
A rule of thumb is the higher the wattage the higher the light output.
Higher. Well, the pitch gets higher. Frequency itself can never change. Pitch is our perception of frequency. The change in pitch due to position is known as the Doppler Effect.