Lesson Notes By Weeks and Term v4 - SHS 2
HEAT
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HEAT
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Subject: Physics
Class: SHS 2
Term: 1st Term
Week: 12
Grade code: 2.1.4.LI.2
Strand code: 2
Sub-strand code: 1
Content standard code: 2.1.4.CS.1
Indicator code: 2.1.4.LI.2
Theme: ENERGY
Subtheme: HEAT
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This lesson introduces the fundamental concepts of heat as a form of energy. We will distinguish it from temperature and learn how to calculate the amount of heat energy transferred. A key focus will be on a property of materials called 'specific heat capacity'. Understanding this helps us explain many everyday phenomena in Ghana, from how long it takes to boil water for *banku* to why the sea feels cooler than the sand at Labadi beach during a hot afternoon. The lesson will culminate in understanding the experimental method used to determine this important property for different substances.
a. Heat vs. Temperature
This is a common point of confusion, so we must be very clear. Heat (Q): Heat is the transfer of thermal energy from a hotter object to a colder object. It is energy in transit. Because it is a form of energy, its S.I. unit is the Joule (J). We feel heat when energy enters our body. Temperature (T): Temperature is a measure of the degree of hotness or coldness of a body. It indicates the average kinetic energy of the particles in the substance. Its S.I. unit is the Kelvin (K), though we often use degrees Celsius (°C) in everyday life.
Analogy: Imagine two buckets of water. Bucket A is wide and shallow. Bucket B is narrow and tall. The amount of water we pour into each bucket is like HEAT. The height (level) of the water in each bucket is like TEMPERATURE.
You can pour the same amount of water (heat) into both buckets, but the water level (temperature) will be much higher in the narrow bucket. Similarly, different substances can absorb the same amount of heat but show different temperature rises. b. Quantity of Heat and Specific Heat Capacity (c)