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 dishwasher, with a power rating of 2300 W, uses the most electrical energy.
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, 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 P=IV, where P=2300W and I=10A, we can calculate voltage V as follows:
V = rac{P}{I} = rac{2300}{10} = 230 ext{ V}
Unit: V
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 is proportional to the current used. As the power rating of the appliance increases, the current 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 a way that meets our current needs without compromising the ability of future generations to meet their own needs. It involves managing resources wisely to prevent depletion.
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 consumption is to turn off lights when they are not needed.
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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