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Without dissipative forces, KE + PE stays constant.
Heat needed to raise 1 kg of a substance by 1 K: Q = mcΔT.
Phase change absorbs heat without changing temperature: Q = mL.
Three modes: conduction in solids, convection in fluids, radiation through vacuum.
Voltage ratio equals turns ratio; rationale for high-V transmission.
High-voltage transmission network delivering electricity from power stations to consumers.