Featured topics
Basic electricity
Ohm's law, power, capacitors and electric energy with units and numeric examples.
Key formulas
- Electric potential energy
The electric potential energy of a charge is the product of the charge and the potential.
- Ohm's law
The potential difference across an ohmic conductor is the product of the current and the resistance.
- Electric power
Electric power is the product of the potential difference and the current.
- Capacitance — basic concept
included as a General Physics concept; the detailed analysis of capacitive circuits can be moved to Electronic Physics.
- Parallel-plate capacitor
The capacitance of a parallel-plate capacitor is proportional to the area and inversely proportional to the separation.