Electricity and Electric Current

2. opposition of a material to the passage of electric charges through it
5. if one thing repels another, or if two things repel each other, an electrical or magnetic force pushes them apart
11. a flash, or several flashes, of very bright light in the sky caused by electricity
12. a substance that allows electricity or heat to pass along it or through it
13. wire covered in plastic that carries electricity
14. a unit for measuring the force of an electric force
17. the glass part that fits into an electric lamp, etc. to give light when it is switched on
20. electricity that gathers on or in an object that is not a conductor of electricity
21. a very small piece of matter (= a substance) that carries no electric charge and that forms part of the nucleus (= central part) of an atom
23. a very small piece of matter (= a substance) with a negative electric charge, found in all atoms
27. a material that resists the movement of electric charge
28. a small flash of light produced by an electric current
29. a form of energy from charged elementary particles, usually supplied as electric current through cables, wires, etc. for lighting, heating, driving machines, etc.
30. an atom or a molecule with a positive or negative electric charge caused by its losing or gaining one or more electrons
31. the smallest particle of a chemical element that can exist

1. a situation in which different things exist in equal, correct or good amounts
3. the steady and continuous movement of something/somebody in one direction
4. a sudden flow of electricity through a part of the body, causing pain and sometimes death
6. electricity that moves from one place to another
7. an electric current that changes its direction at regular intervals many times a second
8. a unit for measuring electrical resistance
9. thick wire that carries electricity
10. to add dirty or harmful substances to land, air, water, etc. so that it is no longer pleasant or safe to use
15. to press two surfaces against each other and move them backwards and forwards; to be pressed together and move in this way
16. the unit for measuring the intensity of an electric current
18. an electric current that flows in one direction only
19. the complete path of wires and equipment along which an electric current flows
22. the part of an atom that contains most of its mass and that carries a positive electric charge
24. something that is wrong or not perfect; something that is wrong with a machine or system that stops it from working correctly
25. the amount of electricity that is put into a battery or carried by a substance
26. a very small piece of matter (= a substance) with a positive electric charge that forms part of the nucleus (= central part) of an atom