Particles can either be positive, negative or neutral. The dynamics of charged particles is what gives rise to electricity.
Positive and Negative Charges
Conductors and Insulators
Static Charge in Real Life
Current is the movement of charged particles, most commonly electrons moving through a metal.
The voltage or potential difference is the driving force behind a current. It is the energy per charge.
All components have some resistance, which is the electric "friction" obstructing the flow of a current moving through a material.
Circuits allow current to flow through components, providing energy to devices.
Diodes and LEDs
Total Resistance in Series and Parallel Circuits
Ammeters in Series
Electrical to Thermal Dissipation
E = IVt
Mains electricity is the alternating current (AC) electric power supplied to homes and businesses.
Power is the rate of energy transfer, and in the UK, energy is distributed by the National Grid.
Signals can either be digital or analogue. Digital signals can be used for logic gates.