(n) the power that is carried by wires, cables etc., and is used to provide light or heat, to make machines work etc.

(v) to have enough money/time to be able to buy or to do something

(adj) able to do something well with no waste of time, money, or energy

(adj) having the skill and ability to produce something new, especially a work of art; showing this ability

(n) the things that are needed for a particular purpose or activity.

(n) a drawing or plan from which something may be made

(v) to give energy to a machine or vehicle to make it work

(adv) after a long time, or after a lot of things have happened

(adj + n) the energy from the sun's light and heat

(n) the act of stopping something bad from happening

(n) a box, bottle, etc., in which something can be stored /transported

(v) to discover or notice something, especially something that is not easy to see, hear, etc.

(v) to be useful to someone or improve their life in some way

(v) to show that a particular situation exists, or that something is likely to be true

(n) a new idea, method, or invention

(n) an object or a piece of equipment that has been designed to do a particular job

(adj) that is replaced naturally or controlled carefully and can therefore be used without the risk of finishing it all (used to talk about energy and natural resources)

(v) to put something somewhere and keep it there to use later

(adj) very useful or important

(n) a long period of time when there is little or no rain and crops die

(v) to try hard to do something that you find very difficult

(adj) easy to carry or move, so that you can use it in different places

(n.) a simple drawing using lines to explain where something is or how something works

(v.) to recognize someone or something and be able to say who or what they are

(v.) to change or behave in a particular way as a result of something