If you mean "dark energy", not much details are known yet about it. It is simply a mysterious substance, believed to accelerate the expansion of the Universe. The fact that the Universe expands faster and faster has been observed; but not much is know about the so-called "dark energy" that supposedly causes this.
Particles falling into a black hole release a large amount of x-rays as they do so. This is not energy from the black hole itself, but energy release that is a sign of a black hole.
Yes, matter and energy can come out of a black hole through a process called Hawking radiation, which was proposed by physicist Stephen Hawking.
As the gravitational potential is converted into kinetic energy by the object falling down the energy gradient.
A black dwarf [See related question]
you can collect energy more when its black
Black lemurs come from Madagascar
All energy used in and by life on earth comes form the Sun - (excepth those ecosystems round black smokers where the enery is chemical energy form earth processes)
The energy can come from just about any source of AVAILABLE energy.
All of your energy come from the food you eat.
Black holes do not emit light, so black holes can not be seen this way. But black holes emit X-rays, but stars are not hot enough to emit X-rays. When black holes suck up stars, energy goes to the black hole, and come out as X-rays.
The Black-Footed Ferret gets its energy from eating and drinking.
No. Sparks itself is not energy. Sparks come from fire. Fire is energy, but not the things that come of it (sparks).