Across
- 3. a rigid bar resting on a pivot, used to help move a heavy or firmly fixed load with one end when pressure is applied to the other.
- 5. one of a set of toothed wheels that work together to alter the relation between the speed of a driving mechanism and the speed of the driven parts.
- 6. produced by the internal heat of the earth.
- 8. of energy conversion in which turbines convert the kinetic energy of wind into mechanical or electrical energy.
- 10. the branch of physics or technology concerned with the mechanical properties of gases.
- 12. the ratio of the force produced by a machine to the force applied to it.
- 13. involving mental or physical effort done in order to achieve a purpose or result.
Down
- 1. form of hydropower that converts the energy of tides into useful forms of power.
- 2. to or denoting the generation of electricity using flowing water to drive a turbine that powers a generator.
- 4. radiant energy emitted by the sun.
- 7. renewable energy source from living or recently living plant and animal materials which can be used as fuel.
- 9. the energy released during nuclear fission or fusion.
- 11. strength or energy as an attribute of physical action or movement.