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Heat and Energy QUi

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