Across
- 1. network of cables and transformers that links power stations to consumers across the country.
- 6. device that measures electric current.
- 8. device that measures potential difference.
- 9. fundamental property of matter that results in an electric field around an object; objects can be electrically positive, negative or neutral (no overall charge); symbol Q, unit coulomb, C.
- 13. amount of energy transferred each second; symbol P, unit watt or joules per second, W or J/s.
- 18. SI unit of potential difference, symbol V; 1 V is the potential difference between two points on a conducting wire when an electric current of 1 A dissipates 1 W of power between those point.
- 19. circuit component that stores energy in the form of chemical energy; a number of electric cells may be joined to form a battery.
- 20. electric circuit in which all components are connected one after the other in a single line.
- 22. electric circuit component with a resistance that decreases as its temperature increases.
- 23. ratio of the potential difference across an electrical component to the current through the component; symbol R, unit ohms, Ω.
- 25. electric circuit component that glows when a potential difference is applied to it.
- 26. material or object that allows electric charge to flow through it.
- 28. electric circuit in which the current divides into two or more paths before combining again.
- 30. a resistor obeys Ohm’s law if the current in the resistor (at constant temperature) is directly proportional to potential difference across it.
- 31. see potential difference.
- 32. SI unit for power, symbol W; a power of 1 W is equal to 1 J of energy transferred in 1 s.
- 33. SI unit of electric current , symbol A; an electric current of 1 A is equal to 1 C of charge passing through a point in a circuit in 1 s.
- 34. material that does not allow electric charges to pass through it (e.g., wood).
- 35. electrical connection between the metal case of an electrical appliance and the ground, used as a safety device to prevent the case becoming charged if touched by a live wire.
- 36. transformer that changes an alternating potential difference across the primary coil to a lower potential difference across the secondary coil.
Down
- 2. electric current component with a resistance that decreases as the intensity of the light falling upon it increases.
- 3. SI unit of electrical resistance, symbol Ω; a component with a resistance of 1 Ω allows a current of 1 A to flow when a potential difference of 1 V is applied.
- 4. process in which energy is moved from one store to another
- 5. conducting wire connection that carries the alternating current from the supply
- 7. electric component that produces a desired amount of resistance to the current within it when a potential difference is applied across it.
- 9. SI unit of electric charge, symbol C.
- 10. visual representation of an electrical component; a standard symbol exists for each type of electrical component.
- 11. conducting wire connection that allows electric charge to return to its source.
- 12. a measure of the energy transferred per unit charge as charges move between two points in a circuit – also called the voltage between two points.
- 14. visual representation of electrical components connected by wires, using standard symbols.
- 15. any resistor that obeys Ohm’s law at constant temperature
- 16. flow of electric charge; the size of the electric current is the rate of flow of electric charge; symbol I, unit amps (A).
- 17. SI unit of energy, symbol J.
- 21. flow of electric charge in one direction only.
- 24. device used to increase (step up) the potential difference of an alternating signal or decrease it (step down).
- 27. circuit component with a low resistance if it is connected one way around in a circuit, or a very high resistance if it is connected the other way around; a diode allows current in one direction only.
- 29. a particle that orbits the nucleus in all atoms; electrons have a negative electric charge.
- 36. transformer that changes an alternating potential difference across the primary coil to a higher potential difference across the secondary coil.