Calculating efficiency (in terms of energy and power)
Quiz by Oak National Academy: GCSE Combined Science AQA Higher
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6 questions
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- Q1Which of the following energy stores does friction transfer energy into?kinetic storechemical storethermal storegravitational store30s
- Q2Why does a hot cup of tea cool down?All of its energy is transferred to the surroundings.Some of its energy is used up.Some of its energy is transferred to the surroundings.All of its energy is used up.30s
- Q3Why is the rebound height of a ball not the same as the height that it was dropped from?The normal reaction force from the ground is less than the gravitational force.Pushing air out of the way transfers some energy to the air particles.Pushing air out of the way uses up some of the ball's energy.Earth's gravitational force is pulling the ball downwards.30s
- Q4The law of conservation of energy states that energy cannot be created or ______.Users enter free textType an Answer30s
- Q5Match the values on the left to the equivalent values on the right.Users link answersLinking30s
- Q6Which of the following statements explains why an electric heater can be considered to be 100% efficient?An electric heater transfers no energy to the surroundings.An electric heater has a low power input.An electric heater transfers all energy usefully into thermal stores.An electric heater has a high power output.30s