Current Electricity & Magnetism - Key Concepts

SI units.
Slopes have physical significance like Voltage vs Current.
A circuit is a closed path with a potential difference, allowing current to exist.
Total current entering a junction equals the total current leaving.
Around any closed loop, the sum of potential drops equals the sum of potential increases.
Resistors in series: equivalent resistance is the sum of their values.
Resistors in parallel: equivalent resistance is less than any individual resistor.
Resistance is directly related to temperature, length, resistivity, and voltage, but indirectly related to cross-sectional area and current.
Ohm's Law: $V=IR$
Energy conversion between mechanical, electromagnetic, nuclear, and thermal forms.
Power is a rate.
Magnetic field lines go from North to South.
Moving electric charges produce magnetic fields.
Magnetic fields produce moving electric charges.
Magnetic forces can be attractive or repulsive.
Electricity is a form of energy transformed by moving electric charges doing work.
Electric fields provide the force that moves charged particles.