Junior Cycle Science Energy: Examine figures 1 and 2. Which l

Question

Examine figures 1 and 2. Which lamp is more efficient? Justify your answer.

Figure 1 shows the Sankey diagram for a filament lamp and indicates that it converts 10 J of electrical energy into light energy, while losing 90 J as heat energy.

Figure 2 shows the Sankey diagram for a compact fluorescent lamp (CFL) which converts 75 J of electrical energy into light energy and wastes only 25 J as heat energy.

Based on this information, the compact fluorescent lamp (CFL) is more efficient than the filament lamp because it utilizes a higher proportion of the electrical energy for useful light output. The CFL converts 75% of the input energy into light compared to only 10% for the filament lamp.

Why is it important to improve the energy efficiency of household devices, such as lamps?

Improving energy efficiency can reduce waste and is beneficial for the environment. It conserves energy resources and lowers energy bills for consumers.

A student is asked to investigate and compare the heat energy produced by filament lamps and CFLs. Apart from the lamps themselves, name a piece of equipment that could be used during this investigation. Explain how this piece of equipment could be used during the investigation.

One piece of equipment that could be used is a thermometer. If the experiment is conducted in a controlled environment, the thermometer can measure the rise in temperature of the surrounding air. This allows the student to compare the heat energy produced by each lamp based on the temperature change.

The energy conversions that happen in a CFL are described in the table below. Complete the table for another device which transforms energy from one form to another and which you designed as part of your studies in science.

Name of the device: Electrical heater
Function of the device: To provide heat
Main useful energy conversion: Electrical to heat
Main loss of energy: Electrical to light

Sketch a Sankey diagram for the device you described in part (d). Label each part of the diagram.

Labelled Sankey diagram.

Examine figures 1 and 2 - Junior Cycle Science - Question 12 - 2019

Worked Solution & Example Answer:Examine figures 1 and 2 - Junior Cycle Science - Question 12 - 2019

Examine figures 1 and 2. Which lamp is more efficient? Justify your answer.

Why is it important to improve the energy efficiency of household devices, such as lamps?

Apart from the lamps themselves, name a piece of equipment that could be used during this investigation. Explain how this piece of equipment could be used during the investigation.

Complete the table for another device which transforms energy from one form to another.

Sketch a Sankey diagram for the device you described in part (d). Label each part of the diagram.

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