Energy, Power & Mechanics

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.

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.