Heat Transfer and Conduction Quiz
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Questions and Answers

Cooler, more ____ fluids sink through warmer less dense fluids.

dense

Why is the freezer compartment typically placed at the top of a fridge?

  • Because it is easier to access the freezer.
  • Because warm air sinks.
  • Because cool air sinks, promoting convection. (correct)
  • Because cold air rises.

What process allows heat energy to travel from the Sun to the Earth?

Radiation

Radiation requires particles to travel.

<p>False (B)</p> Signup and view all the answers

Match the following with their definition.

<p>Conduction = Heat transfer through direct contact Convection = Heat transfer through the movement of fluids Radiation = Heat transfer through electromagnetic waves</p> Signup and view all the answers

Radiation travels at the speed of light.

<p>True (A)</p> Signup and view all the answers

Which of these technologies converts waste heat into electricity?

<p>Thermomagnetic generators (A)</p> Signup and view all the answers

Warmer liquids and gasses ____.

<p>rise</p> Signup and view all the answers

Which of the following best describes heat transfer?

<p>The transfer of thermal energy from one object to another. (D)</p> Signup and view all the answers

Heat always moves from a cooler place to a warmer place.

<p>False (B)</p> Signup and view all the answers

What happens to the temperature of a hot cup of coffee left in a cooler room?

<p>It will cool until it reaches room temperature.</p> Signup and view all the answers

The process by which heat is transmitted through a material from one particle to another through direct contact is called _______.

<p>conduction</p> Signup and view all the answers

Why do metals feel colder than wood when both are at the same temperature?

<p>Metals conduct heat away from your hands more efficiently than wood. (A)</p> Signup and view all the answers

In metals, the outer ________ drift, allowing them to transfer energy easily.

<p>electrons</p> Signup and view all the answers

Convection is the transfer of heat through direct contact between particles.

<p>False (B)</p> Signup and view all the answers

Match the process with its correct description:

<p>Conduction = Heat transfer through direct contact. Convection = Heat transfer by the movement of heated particles in a fluid. Heat = Thermal energy transfer.</p> Signup and view all the answers

Flashcards

What is heat?

The transfer of thermal energy from one object to another.

What is temperature?

The measure of hotness or coldness of an object.

How does heat transfer work?

Heat always moves from a warmer place to a cooler place. For example, a hot cup of coffee left on a table will cool down to room temperature.

What is conduction?

A process by which heat is transmitted through a material from one particle to another. It occurs when there is direct contact. Example: Holding a metal spoon in hot soup.

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Why are metals good conductors?

Metals are good conductors due to their ‘sea of electrons’ that carry heat energy throughout the material.

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How do electrons help metals conduct heat?

The outer electrons in metal atoms drift freely, allowing them to transfer heat energy throughout the metal.

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What is convection?

A process by which heat is transferred or transmitted from one place to another by the movement of heated particles of a liquid or gas. Example: Boiling water in a pot on the stove.

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How does convection work?

When you heat a liquid or gas, the particles move faster and spread out, creating currents that transfer the heat.

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What is a fluid?

A fluid is a substance that can flow and take the shape of its container. Examples include liquids and gases.

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Explain convection.

Convection is the transfer of heat energy through the movement of fluids (liquids or gases). Warmer, less dense fluids rise, while cooler, denser fluids sink, creating a cycle.

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What is radiation?

Radiation is the transfer of heat energy through electromagnetic waves. It does not require a medium (like air or water) to travel. The Sun's heat reaches Earth through radiation.

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Can radiation travel through a vacuum?

Radiation can travel through a vacuum, like the space between the Sun and Earth. Unlike conduction and convection, it doesn't need particles to transfer heat.

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Does radiation travel in straight lines?

Radiation travels in straight lines. It does not bend around corners or objects unless it is reflected or refracted.

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At what speed does radiation travel?

Radiation travels at the speed of light, which is approximately 299,792,458 meters per second (186,282 miles per second).

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What are Thermal Photovoltaic Cells (TPCs)?

Thermal Photovoltaic Cells (TPCs) are devices that convert high-temperature heat directly into electricity. They work by absorbing infrared radiation and converting it into electrical energy.

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Study Notes

Heat Transfer

  • Heat is the transfer of thermal energy from a warmer object to a cooler object.
  • Temperature is a measure of hotness or coldness of an object.
  • Heat is measured in units like degrees Celsius, Fahrenheit, or Kelvin.
  • Heat always moves from warmer to cooler objects.
  • Hot objects in a cool room will cool to room temperature.
  • Cold objects in a warm room will warm to room temperature.
  • A cup of coffee will cool until it reaches room temperature.
  • A popsicle will melt and then the liquid will warm to room temperature.

Conduction

  • Conduction is the transfer of heat through a material from one particle to another.
  • Conduction occurs when there's direct contact between the particles.
  • Heat from a warmer object is transferred to a cooler object.
  • When a metal strip is heated at one end, the heat travels to the other end because of the vibrations of the particles.

Convection

  • Convection is the transfer of heat through the movement of heated particles in a liquid or gas.
  • Heated particles become less dense and rise, while cooler particles become denser and sink.
  • This creates convection currents.
  • In a pot of boiling water, the heated water rises, cooler water sinks, and this creates a circular pattern.
  • Cooler, denser fluids sink through warmer, less dense fluids.
  • Warmer liquids and gases rise.
  • Cooler liquids and gases sink.
  • The air above land warms and rises, and cooler air from above the sea moves in, creating wind.
  • Cold air sinks; that is why a freezer compartment is placed at the top of a fridge.

Radiation

  • Radiation is the transfer of heat energy in the form of electromagnetic waves.
  • Heat energy from the Sun travels to Earth by radiation.
  • Radiation does not require particles for heat transfer, unlike conduction or convection.
  • Radiation travels in straight lines.
  • Radiation can travel through a vacuum, such as space.

Technologies of Transforming Heat into Electrical Energy

  • Thermomagnetic generators convert waste heat into electricity.
  • Thermal Photovoltaic Cells are cells which convert high temperature heat into electricity.
  • Antora Energy has created special cells that convert high temperature heat into electricity, producing 100 times more power than regular solar cells of similar size.

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HEAT TRANSFER Science 7 Quarter 3 PDF

Description

Test your understanding of heat transfer concepts including conduction and convection. This quiz covers key principles such as temperature measurement, heat movement, and particle interaction. Prepare to explore how heat changes in different environments.

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