energy

Why an electrical grid is one giant synchronous machine, what frequency stability and rotational inertia actually mean, how dispatch ordering and ancillary services keep the lights on, and why variable renewable integration is fundamentally an engineering problem at the system level.

Why photovoltaics have a hard thermodynamic ceiling (Shockley-Queisser), why wind power scales with the cube of velocity (Betz), how lithium-ion chemistries actually differ, the learning-curve mathematics that produced the cost declines, and where the materials supply chains concentrate.

What it takes to fuse hydrogen isotopes — the four conditions (temperature, density, confinement time, energy gain), the three main approaches (magnetic, inertial, magnetized target), the engineering problems (tritium, neutrons, materials) that remain after the physics is in hand.

How fission releases energy from heavy nuclei, why neutron moderation determines reactor design, the structural choices behind LWR, CANDU, gas-cooled, fast, and molten-salt reactors, what the fuel cycle actually consists of, and where waste, cost, and safety arguments sit.

How hydrocarbon combustion releases energy as heat, the four canonical thermal cycles that convert that heat into mechanical or electrical work (Rankine, Brayton, Otto, Diesel), why combined-cycle gas plants reach 60% efficiency, and how carbon intensity scales with cycle and fuel choice.

The handful of quantitative concepts that make every energy debate readable — joules and watts, energy density, capacity factor, levelized cost of energy, exergy — and what each one is good and bad at communicating.