What You Buy Energy In — Physics

He began the transaction. He wasn't handing her a box; he was routing a stream of electrons from the city’s fusion grid to her heavy-lift exoskeletons.

"Energy is the ultimate commodity," Elias muttered, watching the meters climb. "The universe is a giant ledger. When you 'buy' energy, you’re just paying to move it from one account to another. You take it from the chemical bonds in a fuel or the heat of a star, and you force it into a kinetic state—motion—to get your job done." "And the tax?" Lyra asked. what you buy energy in physics

One rainy Tuesday, a woman named Lyra walked into his shop. She didn't want batteries or fuel cells. She wanted a "High-Potential Transfer." He began the transaction