Bell work 11/5 Which type of heat transfer is occurring at points X, Y, and Z? (Copy and label the picture.)

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Presentation transcript:

Bell work 11/5 Which type of heat transfer is occurring at points X, Y, and Z? (Copy and label the picture.)

Bell work 11/6 If you cook a pizza in a microwave oven, electromagnetic waves warm the pizza, not heat from the surrounding air. Which two types of heat transfer cook a pizza in microwave oven?

Bell work 11/4 The amount of light energy put out by an incandescent light bulb is under 10% of the electrical energy the bulb uses. What happens to the remaining 90% of the electrical energy used by the bulb? What is the formula for finding the amount of work? If someone lifts a box a distance of 1.5 meters and use a force of 24 newtons, how much work did they do?

Unit 3 Lesson 3 Heat What is heat and thermal energy? Heat is the energy transferred from an object at a higher temperature to an object at a lower temperature. Thermal energy is the total kinetic energy of all of the particles in a substance. Measured in joules (J). The higher the temperature, the higher the amount of kinetic energy. Which cup has a higher amount of average kinetic energy? Why?

Which one has a higher thermal energy? Glass of Water Swimming Pool An ice cube is placed in a glass of warm tea (thermal energy). Later, the ice has melted, and the tea is cooler. Where is the heat moving?

What are three ways heat is transferred? Conduction Convection Radiation

Conduction Pot of mashed potatoes. How does the heat move? Why does the metal handle get hot? Conduction is when heat is transferred through matter by direct contact. The thermal energy will always transfer from the warmer object to the cooler object. Example: Example:

Material that transfers energy as heat very well Conductor Insulator Material that transfers energy as heat very well Examples: metals Material that is a poor conductor of energy as heat.

Convection Convection is the transfer of energy as heat by the movement of a liquid or gas. Convection currents. Example: Example: Example:

Radiation Radiation is the transfer of energy by electromagnetic waves. Example: Microwave cooks by radiation thermal to conduction. Example: Example: