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Heat and Energy QUi
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In which type of heat transfer do particles not need to touch?
Radiation
What happens to energy that is not usefully transferred?
It is wasted, often as heat or sound
What is the energy transfer when burning wood in a fire?
Chemical to thermal and light
What is the energy source for geothermal power plants?
Heat from Earth's core
What type of energy makes wind move wind turbines?
Kinetic
What energy is transferred when ice melts in your hand?
Thermal
What type of energy is used when lifting a book onto a shelf?
Gravitational potential
A microwave oven uses what type of energy to heat food?
Electromagnetic
What type of energy is stored in gasoline?
Chemical
What kind of energy does a running engine release?
Thermal and kinetic
What type of energy do you use when pedaling a bike?
Mechanical
What kind of energy does a glowing light bulb produce?
Light and heat
What is the energy transfer in a blender?
Electrical to kinetic and sound
What energy does a falling apple have?
Kinetic
What type of energy is stored in a compressed spring?
Elastic
A machine is 80% efficient. How much energy is wasted if it uses 1000 J?
200 J
A solar panel receives 500 J of sunlight and produces 100 J of electricity. Efficiency?
20%
An electric heater uses 1200 J and produces 900 J of heat. What is the efficiency?
75%
If a device is 100% efficient, how much energy is wasted?
0 J
A hair dryer uses 1000 J of energy and delivers 600 J of useful heat. What is its efficiency?
60%
How does energy travel from a fireplace across the room?
Radiation
Why do firefighters wear reflective suits?
To reflect radiation
Wearing a thick coat reduces which type of heat loss?
Convection
What type of heat transfer occurs when boiling water circulates?
Convection
How does heat move in space?
By radiation
Why does hot air rise in a room?
It is less dense
Touching a hot metal rod is an example of which heat transfer?
Conduction
What type of heat transfer do we experience from the sun?
Radiation
What is the method of heat transfer through liquids and gases?
Convection
What is the heat transfer that occurs when hot soup warms a metal spoon?
Conduction
What is the main source of energy for Earth’s weather systems?
Solar
What kind of energy transfer happens when you lie in the sun?
Radiation
What kind of energy is used to cook food in a gas oven?
Chemical
Why is insulation used in buildings?
To reduce heat loss
Why does a black surface heat up more in the sun?
It absorbs more radiation
What energy is released by friction?
Heat
What is the energy of moving electrons called?
Electrical
What happens to energy in a closed system?
It is conserved
How does a radiator heat a room?
Convection
What is one reason fossil fuels are not sustainable?
They take millions of years to form
What do we call energy that cannot be reused once it is spent?
Non-renewable
Why is metal a good conductor of heat?
It has free-moving electrons
Which energy transfer happens when metal heats water in a kettle?
Conduction
What energy change happens when charging a phone?
Electrical to chemical
Which type of energy is mostly wasted as heat in machines?
Thermal
What type of energy is considered 100% clean and renewable?
Solar
A motor has 70% efficiency and uses 1000 J of energy. How much useful energy does it give?
700 J
If a light bulb has an efficiency of 25%, how much energy is wasted if 200 J is supplied?
150 J
If a machine uses 500 J and produces 200 J of useful energy, what is its efficiency?
40%
What is the formula for efficiency?
(Useful energy Ă· Total energy) Ă— 100
A ball at the top of a hill has what kind of energy?
Gravitational potential
What energy conversion occurs in a solar panel?
Solar to electrical
What type of heat transfer is blocked by wearing a thermal blanket?
Radiation
What is the energy transfer in a microwave oven?
Electrical to radiation
What energy does a wind turbine produce?
Electrical
What energy change happens when a person eats food and runs?
Chemical to kinetic
What type of energy is produced in power plants by burning fuel?
Thermal
What is the name for energy due to motion?
Kinetic
What unit is used to measure temperature?
Degrees Celsius
What type of energy travels in waves through space?
Radiation
What type of energy transfer causes the attic to be hotter than the basement?
Convection
What is the movement of heat through solids?
Conduction
What kind of energy does a stretched rubber band have?
Elastic
What type of energy is released by a candle?
Heat and light
What energy transfer happens when you rub your hands together?
Kinetic to thermal
What is the energy stored in the nucleus of an atom called?
Nuclear
What energy transformation happens in a toaster?
Electrical to thermal
What type of energy powers a hydroelectric dam?
Kinetic
What type of energy is stored in food?
Chemical
What is the main type of energy used by plants to make food?
Solar
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