Electricity

2. circuit in which electric current has only one path to follow
4. electromotive force on potential difference expressed in volts
6. temporary magnet made by wrapping a wire coil, carrying a current around an iron coil
7. a device for detecting the presence and determining the sign of electric charge
8. tendency for a material to oppose electron flow and change electrical energy into thermal energy and light; measured in ohms
10. transfer of thermal energy by collisions between particles in matter at a higher temperature and particles in matter at lower temperatures
14. Current electric current that reverses its direction of flow in a regular pattern
15. a body as a piece of iron or steel that passes the property of attracting certain substances, as iron
16. device that uses electromagnetic induction to increase or decrease the voltage of an alternating current
18. Current electric current that flows in only one direction
20. force that opposes the sliding motion between two touching surfaces

1. Motor device that converts electrical energy to mechanical energy by using the magnetic forces between an electromagnet and permanent magnet to make a shaft rotate
3. device that uses electromagnetic induction to convert mechanical energy to electrical energy
5. Law states that the current in a circuit equals the voltage difference divided by the resistance
6. Induction process in which electric current is produced in a wire loop by a changing magnetic field
9. circuit in which electric current has more than one path to follow
11. Cell in which the electrolyte exists form of a paste is absorbed in a porous medium
12. the art of inducting or state of being inducted
13. Poles region on a magnet where the magnetic force exerted by a magnet is strongest; like poles repel and opposite poles attract
17. a flow of electric charge
19. the accumulation of excess electric charge on an object