Thermal Energy and Specific Heat Capacity

Mr. Reese from Mars Preschool Science demonstrates a practical experiment to measure the specific heat capacity of materials like aluminium, brass, and copper. The video explains the setup, including the use of a heater and thermometer, and the importance of avoiding air gaps for accurate readings. It covers the calculation of specific heat capacity using the formula involving energy, mass, and temperature change. Two methods for measuring power are discussed: using a joule meter and a more accurate method with a voltmeter and ammeter. The video concludes with graphing results and discussing the impact of insulation on energy loss.

What is the purpose of adding a few drops of water in the hole for the thermometer?

• To cool down the thermometer

• To lubricate the thermometer

• To prevent an air gap for accurate readings

• To clean the thermometer

What is the initial temperature of the aluminium block before starting the experiment?

• 20 degrees Celsius

• 26 degrees Celsius

• 22 degrees Celsius

• 24 degrees Celsius

Which of the following is the correct formula for specific heat capacity?

• SHC = Energy / (Mass * Temperature Change)

• Energy = SHC / (Mass * Temperature Change)

• SHC = Energy * Mass / Temperature Change

• Energy = Mass * SHC * Temperature Change

How many joules are represented by 19 flashes in 30 seconds using a joule meter?

• 1900 joules

• 190 joules

• 19 joules

• 19000 joules

What is the more accurate method to measure power in this experiment?

• Using a stopwatch

• Using a voltmeter and ammeter

• Using a joule meter

• Using a thermometer

What is the unit for power?

• Joules

• Watts

• Volts

• Amperes

What should be plotted on the y-axis of the graph?

• Temperature

• Energy

• Time

• Power

What is the specific heat capacity of aluminium according to the experiment?

• 1050 J/kg°C

• 900 J/kg°C

• 1000 J/kg°C

• 950 J/kg°C

Why is the calculated specific heat capacity higher than the actual value?

• The mass of the block is incorrect

• The power supply is too high

• The thermometer is faulty

• The block is not insulated

What can be done to reduce energy loss in the experiment?

• Use a different material

• Insulate the block with foam

• Increase the voltage

• Use a larger block