V is electric potential or voltage in volts. Electricity generation is often done with electric generators, but can also be supplied by chemical sources such as electric batteries or by other means from a wide variety of sources of energy. Electric power is generally supplied to businesses and homes by the electric power industry.
Depending on where you adopt, fees can range up to $400. Purchasing a Great Dane from a breeder can cost between $600 and $3,000, depending on the breeder and the dog itself. The higher price tag usually comes with a show-quality dog, which you might not need if you're just in the market for a pet.
A puppy selling for $300 is unlikely to have generations of dogs with health clearances behind it. Not only that, but you may find that the poorly bred dog may not exhibit the golden traits that you love. To answer your question, the price of a quality bred dog is the range that you stated, about $1,000-$1,500.