What is Electricity?  

Matter is made up of tiny particles called atoms. At the center of the atom is the nucleus surrounded by negatively charged particles called electrons. Electricity is as a result of the flow of electrons. The nucleus constitutes of positively charged particles called protons and uncharged particles called neutrons. Usually the positive charge of the proton is equal to the negative charge of an electron. Hence there is a balancing force between the electrons and protons. However when an outside force affects the balancing force between the protons and electrons, the atom will tend to gain or lose an electron. The free movement of lost electrons from an atom amount to the Electric Current. So electricity is a current of electrons and is analogous to a current or flow of water. Electricity in motion is called electric current

 What is power?

Power is the time rate at which work is done or energy emitted or transferred. Power is a secondary energy source as a result of conversion of primary energy sources. Some examples of primary energy sources include: natural gas, nuclear energy, coal, oil, and other natural energy sources. In summary power is the rate of doing work and electric power is measured in Watts (W) or kilowatts (kW) or Megawatts (MW) (mega is million), or Gigawatts (GW) (billion) etc

What is energy?

Energy is the capability to change or move matter. Electric energy is the power consumed in Unit time. Electric energy is measured in Watt hour (Wh), kilowatt hour (kWh), mega watt hour (MWh), Giga watt hour (GWh) etc