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Energy Efficiency and Real-Life Use — Free MYP1 Sciences Practice Questions
1QuestionCalculating Efficiency PercentConcept Practice
2 marks~3 minCriterion A
A desk lamp uses of electrical energy. Only becomes useful light energy. The remaining is wasted.
a
Identify the type of energy that the wasted becomes. [1]
b
Describe why this wasted energy is not useful for the lamp. [1]
Solutions
2QuestionEnergy Labels and Appliance RatingsAssessment Practice
6 marks~9 minCriterion C
Maya checks the energy labels on three appliances at home. The monthly electricity use for each is shown below.
Hair dryer: 120 units
Mini fridge: 80 units
Gaming console: 150 units
Hair dryer: 120 units
Mini fridge: 80 units
Gaming console: 150 units
a
Identify the appliance that uses the least electricity each month. [1]
b
List the three appliances in order from lowest to highest monthly electricity use. [2]
c
Maya's friend says, "The appliance that uses the least electricity is always the best choice for saving energy." Describe one reason why this statement is not always correct. [3]
Solutions
3QuestionCalculating Efficiency PercentConcept Practice
2 marks~3 minCriterion D
A family's old refrigerator uses 600 kWh of electricity each year. Their new refrigerator uses only 240 kWh each year.
a
Identify one real-world benefit of choosing the new refrigerator. [1]
b
Describe how this benefit happens, using the electricity figures above. [1]
Solutions
4QuestionEnergy Labels and Appliance RatingsConcept Practice
5 marks~8 minCriterion B
Five light bulbs have the following energy ratings and power use:
| Bulb A | 5-star | 8 W |
|---|---|---|
| Bulb B | 4-star | 12 W |
| Bulb C | 3-star | 16 W |
| Bulb D | 2-star | 20 W |
| Bulb E | ? star | 24 W |
a
Identify the pattern in the table by calculating the difference in power use between any two bulbs that are next to each other in the star ratings. [1]
b
State the star rating that Bulb E should receive. [1]
c
Describe how the star rating of a bulb is related to the amount of electricity it uses. Use Bulb A and Bulb E in your answer. [3]
Solutions
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