Electrical energy is one of the most important types of energy that we use in our daily lives - Junior Cycle Science - Question 13 - 2019
Question 13
Electrical energy is one of the most important types of energy that we use in our daily lives.
An electrical appliance has a power rating which tells you how much el... show full transcript
Worked Solution & Example Answer:Electrical energy is one of the most important types of energy that we use in our daily lives - Junior Cycle Science - Question 13 - 2019
Step 1
Which appliance listed in the table uses the most electrical energy?
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Answer
The appliance that uses the most electrical energy is the Dishwasher, which has a power rating of 2300 W.
Step 2
Select one of the appliances from the table above and name a useful form of energy produced when the appliance is being used.
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Answer
Name of appliance: Dishwasher
Useful form of energy: Heat (and Kinetic).
Step 3
For the appliance you have selected, name an unwanted form of energy produced.
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Unwanted form of energy: Sound.
Step 4
For the appliance you have selected, calculate the voltage applied across the appliance. Include the unit for your answer.
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Answer
Calculation: Using the formula for power, which is given by P=IV, where P is the power, I is the current, and V is the voltage. Rearranging this gives V=IP. For the dishwasher, P=2300 W and I=10 A. Thus,
V=102300=230extV.
Step 5
What pattern, if any, exists between the power rating of the appliance and the current used?
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The pattern that exists is that the power rating of an appliance is proportional to the current used. As the power rating increases, the current used also tends to increase.
Step 6
What do you understand by the term sustainability?
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Sustainability refers to the use of resources in such a way that they are not depleted or permanently damaged. It aims to ensure that future generations can also meet their needs.
Step 7
Suggest one way in which we can reduce how much electrical energy we use.
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One way to reduce electrical energy use is to turn off lights and appliances when they are not in use.
Step 8
Identify two renewable sources of energy from the list below by placing a tick (✓) in each of the correct boxes.
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✓ Solar
✓ Wind
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