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4.Match each action with its consequence. Then identify the device or feature described:

  1. A burglar disconnects the supply a A magnet on the moving part trips a

switch

  1. The glass is broken b Tamper sensors trigger the alarm

  2. A door is opened c The alarm continues to operate on batteries

  3. A window is opened d Two thin metal plates come in contact

  4. You’re not there to reset the system e The foil breaks too

  5. A burglar tries to force the alarm open f A magnet on the door trips a switch

on the frame

  1. Someone steps on them g The alarm stops after a set time

5. Complete these sentences with suitable action or consequence.

  1. If pressure mats are constantly walked on…….

  2. If you fit an exit delay………….

  3. If your system doesn’t have an automatic cut-off……

  4. If a burglar walks in front of a motion sensor…..

  5. Vibration sensors will respond if…….

  6. Tamper sensors will trigger the alarm if…..

  7. A magnet on the moving part trips a switch if….

  8. The alarm stops after a set time if……

6. Choose the correct variant.

  1. Magnetic switches … on windows and doors.

a) is used; b) are used; c) was used; d) will be using.

  1. The pressure … two thin metal plates to come in contact.

  1. causes; b) cause; c) is causing; d) is caused.

  1. Some break detectors use a thin metal foil which … around the edge of the glass.

  1. glued; b) glues; c) is glued; d) was being glued.

  1. Motion sensors use passive energy … movement within their range.

  1. to detect; b) for detect; c) for detection; d) detect.

  1. Sensors will trigger the alarm if a burglar … to force the door open.

  1. will try; b) tries; c) tried; d) would try.

7. Answer the following questions about the text.

  1. Where are magnetic switches used?

  2. How do they work?

  3. Do all break detectors use metal foil?

  4. What is the difference between pressure mats and motion sensors?

  5. Why are entry and exit delays necessary?

  6. What are automatic cut off, tamper protection and battery backup used for?

  7. What effect does light have on LDR?

8. Complete the table

Sensing Device Used to detect

LDR -----------

----------------- heat

----------------- sound

9. Use words from the text to complete the following table:

TERM OPPOSITE

cut-off saturation

fixed resistor

increases

energize

slow

to cause

forward bias

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