Across
- 2. a set of stairs
- 5. a device in a building which sounds a fire alarm when smoke passes through it
- 6. to stop a piece of electrical equipment being connected to an electricity supply
- 7. a serious or dangerous situation that needs immediate action
- 9. to put a piece of equipment somewhere and make it ready to use
Down
- 1. to put or turn on/off (an electric current / light etc)
- 3. necessary
- 4. to make something less
- 8. a machine that carries people up and down in tall buildings