Energy Transformations & Power Systems

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Science energy quiz

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Maureen Macaranas

Philippines

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Energy Transformations & Power Systems


Froggy Jumps Energy Transformations & Power SystemsOnline version Science energy quiz by Maureen Macaranas 1 Which energy sequence best describes a bicycle rider going downhill after pedaling up? a Chemical → Mechanical → Gravitational Potential → Kinetic b Mechanical → Chemical → Gravitational Potential → Kinetic c Kinetic → Mechanical → Gravitational Potential → Chemical 2 What explains why the total mechanical energy of a falling ball stays constant on a frictionless path? a Law of conservation of mechanical energy b Conservation of momentum c Law of inertia 3 During a ramp test, energy changes from potential to kinetic as height decreases. Which is true? a Potential energy changes to kinetic energy b Kinetic energy changes to potential energy c Energy is created from nothing 4 A battery-powered toy car moves when the switch is turned on. Which sequence best describes the energy transformation? a Electrical → Chemical → Mechanical b Chemical → Electrical → Mechanical c Radiant → Electrical → Chemical 5 What is the main idea behind a heat engine? a Heat is created from nothing to do work b Heat flows from a high to a lower temperature source to produce work c All heat can be converted to motion without losses 6 Why are most heat engines not 100% efficient? a All heat becomes motion b Heat cannot be converted to energy c Some heat is lost to the surroundings 7 A candle heats water in a container. What energy is supplied by the candle to heat the water? a Electrical energy b Thermal energy c Chemical energy 8 Ben builds a steam engine; steam pushes a piston to move a wheel. This shows what? a Motion produces heat in the water b Heat energy can be converted into work c Energy is created from nothing 9 If a model engine’s pistons move faster when hot, what change would improve movement? a Increase the fuel temperature slightly b Hide the heat source c Make the piston heavier 10 Which statement best explains how a heat engine works? a Heat always stops motion b Motion is independent of heat c Heat can do work, and motion depends on temperature 11 Which machine is an example of a heat engine? a Flashlight b Electric fan c Car engine 12 A heat pump moving heat indoors shows what principle? a The heat pump creates heat from electricity b Heat is blocked from leaving the house c The heat pump transfers heat from one place to another 13 A guitar string vibrates when it is plucked, producing sound. Which type of energy is mainly produced? a Electrical energy b Chemical energy c Sound energy 14 In a car engine, how does burning fuel result in work? a All heat is converted to motion b Part of the heat becomes mechanical work while some escapes as heat c Heat is prevented from leaving the engine 15 What is the role of the compressor in a heat pump? a It removes cold air from the house b It increases the pressure of the refrigerant so it can release heat indoors c It burns refrigerant to create heat 16 What is the correct order of how electricity reaches homes? a Distribution → Generation → Transmission b Transmission → Generation → Distribution c Generation → Transmission → Distribution 17 Why is electricity first produced in power plants? a To distribute electricity without wires b To convert mechanical energy from turbines into electrical energy c To store electricity permanently 18 Why is electricity transmitted using high voltage lines over long distances? a To increase heat in the wires b To reduce energy loss during transmission c To store electricity in the wires 19 Why must electricity pass through transformers before reaching homes? a To lower the high voltage so it becomes safe for household appliances b To heat the wires c To monitor electricity flow 20 What is the best solution for brownouts caused by old transmission lines? a Increase appliance use in homes b Upgrade and strengthen transmission lines c Store electricity in power plants 21 Why are heat engines not 100% efficient beyond losses? a Heat is created from nothing b Some heat is lost to the surroundings c All heat becomes motion 22 What energy sequence is shown by a candle-powered steam engine lighting a bulb? a Chemical → Mechanical → Thermal → Electrical → Light b Thermal → Chemical → Mechanical → Electrical → Light c Chemical → Thermal → Mechanical → Electrical → Light 23 Which statement best explains how electricity reaches homes? a Generation → Distribution → Transmission b Distribution → Transmission → Generation c Generation → Transmission → Distribution 24 What happens when a heat engine converts energy? a Electrical energy is created from nothing b Thermal energy is converted into mechanical energy c Kinetic energy is created from nothing 25 Which of the following statements correctly describes the relationship between generation, transmission, and distribution? a High voltage is used to reduce energy loss, then lowered for safe home use. b Voltage is increased during distribution and decreased during transmission. c Electricity is distributed before it is generated.

Energy Transformations & Power Systems

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Energy Transformations & Power SystemsOnline version

by Maureen Macaranas

Which energy sequence best describes a bicycle rider going downhill after pedaling up?

What explains why the total mechanical energy of a falling ball stays constant on a frictionless path?

During a ramp test, energy changes from potential to kinetic as height decreases. Which is true?

A battery-powered toy car moves when the switch is turned on. Which sequence best describes the energy transformation?

What is the main idea behind a heat engine?

Why are most heat engines not 100% efficient?

A candle heats water in a container. What energy is supplied by the candle to heat the water?

Ben builds a steam engine; steam pushes a piston to move a wheel. This shows what?

If a model engine’s pistons move faster when hot, what change would improve movement?

Which statement best explains how a heat engine works?

Which machine is an example of a heat engine?

A heat pump moving heat indoors shows what principle?

A guitar string vibrates when it is plucked, producing sound. Which type of energy is mainly produced?

In a car engine, how does burning fuel result in work?

What is the role of the compressor in a heat pump?

What is the correct order of how electricity reaches homes?

Why is electricity first produced in power plants?

Why is electricity transmitted using high voltage lines over long distances?

Why must electricity pass through transformers before reaching homes?

What is the best solution for brownouts caused by old transmission lines?

Why are heat engines not 100% efficient beyond losses?

What energy sequence is shown by a candle-powered steam engine lighting a bulb?

Which statement best explains how electricity reaches homes?

What happens when a heat engine converts energy?

Which of the following statements correctly describes the relationship between generation, transmission, and distribution?