If it is spherical then where/how does the current flow?
No, water is not a good conductor of electricity. Check related link below for more information.
Yes, calcium is a good conductor of heat and electricity. Most metals are good conductors of heat and electricity. Most nonmetals are not good conductors of heat and electricity.
Wow, is it? You have to be more specific. What is a good conductor and of what, heat, sound, electricity or spaghetti monsters.
A good conductor will conduct more heat, or more electricity, depending on the context, than a bad conductor. That is, it will transfer more of either in any given time period.
A copper penny (is more an alloy than pure copper) is a conductor of electricity.
Plain distilled (or double distilled) water with no impurities is a poor conductor of electricity. The more impurities it has the better conductor it becomes
water is the best conductor of electricity, compare to air the atoms in water is more closely to each other and that makes water more conductive than air, glass can be conductor it depends on it composition but not as good as water and wood is not a conductor unless it's wet.
Because electricity will travel through almost everything but wood, rubber, and a few more. Scissors have metal in them, and that is the thing that electricity loves to travel through.
A substance that lets electricity flow through it is called a conductor (or sometimes, to be more explicit, it is called an electrical conductor). Substances which do not permit the flow of electricity are called insulators.
Current specifically refers to the movement electrons through an electric conductor. Electricity is a more general term.
It entirely depends upon what metal, or more likely metal compound, the nail is made out of. However, as with anything made of metal, you can be fairly sure it will be a good conductor of electricity no matter what it's made from.
Silver is a better conductor than copper, but copper is more commonly used because it is cheaper and isn't as easily tarnished.