I don't think so; rubber doesn't conduct electricity
No, not all circuits contain electricity. A circuit is simply a closed loop through which electricity can flow. Electricity will only flow through a circuit if there is a power source, such as a battery or wall outlet, providing the electrical energy.
An object that does not allow electricity to flow through easily is an insulator. It is so hard that it often won't go through at all. Sometimes you find an exception, like lightening. There is nothing that electricity cannot flow through altogether.
A conductor, such as metal, allows electricity to flow through it because it has free-moving electrons. An insulator, on the other hand, does not allow electricity to flow through it because it restricts the movement of electrons. Semiconductors, like silicon, have properties in between conductors and insulators and can selectively allow electricity to pass through them under certain conditions.
Hydro electricity is electricity generated by moving water, usually from dams nowadays. Electrical power is all the same. It flows through wires.
No order. It flows in all of the parts at the same time.
Sure; nails are usually made from some metal, and all metals are conductors.
Note: "electricity" is not conducted, only electrical current (the flow of electrons) is. Electricity is the field that covers all things electrical. The wood in a pencil is an insulator. If it is wet, it is a poorer insulator, but only a poor conductor. The carbon (lead) in the pencil is a poor conductor. The metal holding the eraser is a good conductor. The rubber eraser is a poor conductor. You really have to address the conductivity of specific substances, not items that are build from a variety of substances.
Iron (like all material) has resistance to current flow. When electrons do flow through iron you get the standard I squared R losses ... all of which is heat.
Electric currents will not flow through a pencil because the graphite in a pencil is not a good conductor of electricity. Graphite is considered a semiconductor, so it does not allow electricity to flow as easily as a metal conductor.
Most substances fall into two categories - conductors and insulators. Conductors are those which electricity can pass through relatively easily. Metals are the usual example, but other substances such as graphite and polar liquids such as water are also good conductors. Insulators are poor conductors: those that electricity cannot pass through easily. Most plastics are insulators. Some substances fall in between: these are semiconductors, which allow electricity through in some instances, but not in others. This property makes them very useful in electronics. Some substances can be such good conductors that, under some circumstances, they can allow electricity to pass through them with no resistance at all. These are called superconductors.
Electricity is the flow of electrons and protons traveling through a small area I think... All the other ones are really hard so here...=)
At very cold temperatures, certain materials like superconductors can lose all electrical resistance, allowing electricity to flow through them without any loss of energy. This phenomenon is known as superconductivity.