Across
- 4. The magnetic relay works by using a smaller current electromagnet circuit to turn on a more _________ circuit
- 5. A _______ bar is not suitable for use as the core of an electromagnet as it becomes permanently magnetised
- 6. The circuit ________ is another application of an electromagnet
- 9. The insertion of a core within a solenoid will help to produce an electromagnet which is about a __________ times stronger
- 10. The magnetic tape or hard disc of a computer is usually coated with a layer of ______ oxide
- 12. A current-carrying solenoid is also known as an _____________
- 13. The normally ________ relay: output witch is off when input switch is on
- 14. By _________ the current flowing through an electromagnet, different tracks of magnetism can be created by a tiny electromagnet for storing information
Down
- 1. When too much current flows through the electromagnet within a circuit breaker, the electromagnet will become strong enough to cause the __________ to open and cut off the current
- 2. The poles of an electromagnet can be changed by ___________ the current or polarity of the batteries
- 3. TV studios use magnetic _______ to record pictures and sounds
- 7. One application of the electromagnet is the magnetic _______
- 8. The strength of the electromagnet can be stronger by ___________ the current and the number of turns per unit length of the solenoid
- 11. The normally ______ relay: output switch is off when input switch is off
- 13. An electromagnet usually has many coils wound around an iron _______