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The diagram shows a bimetallic strip as used in a simple fire alarm.

1. Name the suitable materials for A and B.

2. What adjustments would you make to the arrangments shown, to make the alarm operate at lower temperature?  Give reasons for your answer.

Asked by Topperlearning User 4th June 2014, 1:23 PM
Answered by Expert

1. A is invar and B is brass.

2. The contact points are brought closer to one another.  This makes the bimetallic strip to make contact at lower temperature and hence, bell starts ringing.

Answered by Expert 4th June 2014, 3:23 PM
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