Gravitational potential energy (from water behind a dam) is converted into kinetic energy (flowing water) and then into electrical energy. Q: How can we make present energy resources last longer? conserving energy (reducing needs) and increasing the efficiency of energy-using devices.
A10: The Earth’s internal heat is continuously produced by radioactive decay and residual heat from planet formation, so it is essentially inexhaustible on a human timescale.
Used primarily to generate electricity and provide transportation fuel.
: Reducing energy needs and increasing efficiency to make current resources last longer. Practical Ways