Lesson Energy transfers lessonWorksheet Energy transfers worksheetLab Energy transfers labTest Energy transfers testQuiz Energy transfers quizQuick answer: An energy transfer is the movement of energy from one store to another or its change from one form to another. This grade 7 science quiz checks energy transfers with 10 multiple-choice questions and instant feedback; every answer comes with a short explanation.
The tests book with mark schemes · Grade 7 science
Every chapter in one PDF school book of 64 pages, to print or keep on your tablet.
See the book This energy transfers quiz for grade 7 science has quick multiple-choice questions with instant feedback. Need a refresher first? Read the lesson or do the worksheet on energy transfers .
Ten quick multiple-choice questions on energy transfers, wasted energy and efficiency. Choose one answer for each question and read the explanation afterwards to learn from any mistakes.
Level: Grade 7 science (Year 8 · Class 7) · Curriculum: MS-PS3-5
Which sentence matches the conservation of energy? Which form of energy is usually wasted by an electric motor? A device takes in 200 J and gives out 150 J of useful energy. How much is wasted? A device takes in 50 J and gives 20 J of useful energy. What is its efficiency? What does a Sankey diagram show? What is the energy chain of a solar-powered calculator? Which statement about efficiency is correct? Why is wasted thermal energy hard to reuse? Which change makes a lamp more efficient? A heater gives out 500 J of thermal energy from 500 J electrical input. How is this described? State the law of conservation of energy. — Energy is never created or destroyed, only transferred. What is wasted energy? — Energy transferred to stores that are not useful. Which form is usually wasted? — Thermal energy. Efficiency formula? — Useful energy output ÷ total input × 100 %. Can efficiency exceed 100 %? — No, never. What does a Sankey diagram show? — How input energy splits into useful and wasted outputs. Wasted energy formula? — Total input minus useful output. Energy chain of a wind turbine? — Kinetic → electrical. Unit of energy? — The joule (J); 1 kJ = 1000 J. Why can wasted thermal energy not be reused? — It spreads out into the surroundings. Keep going with Lina
The tests book with mark schemes · Grade 7 science
Every chapter in one PDF school book of 64 pages, to print or keep on your tablet.
See the book 
