Across
- 2. The rate at which an appliance transfers energy. For a circuit component, it is equal to the product of the current passing through it and the potential difference across it.
- 4. Electric _________: The rate of flow of electrical charge. Its value is the same at any position in a single closed loop. In metals, the charges that flow are electrons.
- 6. A temperature dependent component, whose resistance increases as its temperature decreases.
- 10. ________ Wire: The blue coloured wire that completes the circuit in a mains power supply.
- 11. A safety device consisting of a thin metal filament that melts and cuts off the power supply if there is a surge in current. Connected to the live wire.
- 12. Light ________ Diode: A device that gives out light when a current flows through it. Current can only flow through it in one direction, and a minimum voltage must be applied across it before it illuminates.
- 13. Components connected in ________ have the same potential difference (voltage) across each component. The total current is equal to the sum of the currents flowing through each component.
- 17. it. Circuit breakers can be reset and are quicker acting than fuses.
- 20. ______ Wire: The green and yellow striped safety wire connected to metal casings, that prevents an appliance from becoming live.
- 21. The unit of potential difference (voltage). One ____ is equal to one joule per coulomb.
- 23. A device connected in series with a component to measure the current that flows through it.
- 25. A device that is connected in parallel with a component to measure the potential difference (voltage) across it.
- 26. A material that doesn’t allow electrical charge to flow.
- 29. The sum of the currents entering a _______ must always equal the sum of the currents leaving it. This is a consequence of the conservation of charge.
- 31. A light emitting component consisting of an enclosed metal _______. Its resistance increases as the ________'s temperature increases.
- 32. The brown coloured wire that carries the alternating current from the supply in a mains power supply.
- 33. A measure of the opposition to current flow.
- 35. Electrical ________ is transferred to thermal _______ when current does work against a resistance. In metals this is a result of collisions between electrons and ions.
- 36. _______ charges:When two charges of the same polarity meet, they will repel.
Down
- 1. Circuit ________: A safety device that cuts off the power supply if a surge of current passes
- 3. The unit of power.
- 5. A material that allows electrical charge to flow easily. Metals are particularly good conductors due to the free electrons in their structures.
- 7. ________ Difference: The energy that is transferred per unit charge between two points in a circuit. It is often also called a voltage.
- 8. Light ________ Resistor (LDR): A light sensitive component whose resistance decreases as the light intensity increases.
- 9. ________ Electricity: An a.c supply, which in the UK has a frequency of 50Hz a value of 230V.
- 14. The unit of current.
- 15. The unit of charge.
- 16. Current flow consisting of charges flowing in a single direction only. Batteries and cells provide _________ current.
- 18. _______ Charge: The charge caused by an imbalance of positive and negative charges in, or on, an object’s surface. It is often caused by electrons being rubbed from one surface onto another.
- 19. The unit of resistance
- 22. The removal of excess charge by providing a low resistance path for electrons to flow through.
- 24. A consequence of static charge building up in the clouds. _______ strikes are caused by the discharge of this charge.
- 27. _______ Charges: When two charges of opposite polarities meet, they will attract.
- 28. A type of electric current that continually changes direction.
- 30. ________ Conductor: A conductor whose current flow is directly proportional to the potential difference (voltage) across it, when held at a constant temperature.
- 34. A component that only allows current to flow through in the forward direction. They have very large resistances in the reverse direction.