Physics

• an atom is the basic unit of matter and the smallest particle that retains its characteristics in a chemical reaction
• charge separation is the imbalance of charges between two locations (also known as 'static electricity')
• a conductor is a material that has free electrons and allows electrons to flow through it
• an electric current is the flow of charges from one location to another, measured in amperes (A)
• electrical resistance is the opposition to electron flow provided by a material, measured in ohms (Ω)
• elementary charge is the size of the charge of a single electron or proton
• EMF is the energy (per unit charge) provided to a circuit by a power source, measured in volts (V)
• energy is the ability to do work, measured in joules (J)
• a free electron is an electron that is not tightly held by its nucleus
• an insulator is a material that does not have free electrons and typically does not allow charge to flow through it
• an ion is a particle that has a positive or negative charge
• a load is any part of an electrical circuit that transforms electrical potential energy into another kind of energy
• potential difference is the energy (per unit charge) transformed by a load, measured in volts (V)
• power is the amount of energy that is transformed by a load every second
• a resistor is an object that resists the flow of electrons
• what is power?

  The amount of energy that is transformed by a load every second