PhysicsChapter 2: Thermal Expansion and Change of State
Bimetallic Strip
Brass expands more than iron in a typical school strip, so the brass side becomes longer and the pair curves.
Learning objectives
- Define and explain bimetallic strip.
- Apply bimetallic strip to a focused FBISE question.
- Check the answer for correct terms, evidence, working, and units.
Definition
Brass expands more than iron in a typical school strip, so the brass side becomes longer and the pair curves. Cool it and it straightens. In a simple thermostat the curve breaks a contact and the heater switches off.
Where / symbols
- Bimetallic Strip
- Brass expands more than iron in a typical school strip, so the brass side becomes longer and the pair curves. Cool it and it straightens. In a simple thermostat the curve breaks a contact and the heater switches off.
Overview
Learn the idea, then use it:
Core Understanding
Brass expands more than iron in a typical school strip, so the brass side becomes longer and the pair curves. Cool it and it straightens. In a simple thermostat the curve breaks a contact and the heater switches off.
Examples different expansions · thermostat · gaps for expansion · BIMETALLIC STRIP: Brass expands more than iron in a typical school strip, so the brass side becomes longer and the pair curves. Cool it an
Exam Application
State the correct term, connect it to the chapter rule or evidence, and use a clear example or calculation.
Examples Define first · Show the rule or evidence · Check units, labels, and conclusion
WHAT — BIMETALLIC STRIP
Brass expands more than iron in a typical school strip, so the brass side becomes longer and the pair curves. Cool it and it straightens. In a simple thermostat the curve breaks a contact and the heater switches off.
HOW — Use the idea
Identify what is given, select this topic's rule or evidence, apply it one step at a time, and check the result.
In simple words
Do not merge bimetallic strip with a neighbouring idea that uses a different definition, rule, or method.
Key points
- different expansions
- thermostat
- gaps for expansion
Exam preparation
Exam Focus
Quick revision
Revision Zone
Review the key facts, formulas and checks before you move on.Bimetallic Strip
Sticky Notes · Quick Revision
Core Idea
- Brass expands more than iron in a typical school strip, so the brass side becomes longer and the pair curves.
Key Points
- different expansions
- thermostat
- gaps for expansion
Simple Check
- Explain bimetallic strip in your own words and connect it to one chapter example.
How to Answer
- Define the idea, show the main rule or evidence, apply it, and check the final statement.
Common Mistake
- Do not merge bimetallic strip with a neighbouring idea that uses a different definition, rule, or method.
FBISE Exam Tip
- Use the exact term, show working where needed, and include units or labelled evidence.
60-second revision
- Brass expands more than iron in a typical school strip, so the brass side becomes longer and the pair curves.
- different expansions
- thermostat
- gaps for expansion
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