Energy Loss

Heat loss to the environment occurs when matter is hotter than its surroundings. Numerous solutions have been created to solve this problem. Below is an example of one possible solution. Double walled cups are a solution to the problem because:

• They act as insulators and retain the heat of the matter inside.

• They act as conductors and move the heat through the system.

• They help increase heat transfer to the surrounding environment.

• They help reduce heat loss due to radiation to the surrounding environment.

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Home energy efficiency is a growing industry. There are multiple ways that homes can be made more energy efficient. Using the figure below and your knowledge of science; one solution to creating more efficient home is:

• Use efficient windows and doors to decrease heat transfer.

• Use efficient appliances to transfer more energy within the home.

• Reduce insulation to increase the energy transfer at the roof.

• Reduce power entering the home to increase overall efficiency.

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When a car travels, the motor transfers chemical energy into mechanical energy and then rotates the wheels, which make contact and exchange energy by friction with the road and create movement. There is a significant amount of energy loss within the system. Using the information below, one way to decrease energy loss within a gasoline vehicle system is:

• Reduce the exhaust heat.

• Idle the vehicle more often.

• Use the water pump less often.

• Increase the friction within the engine.

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An electric pencil sharpener uses electricity to make its motor spin. The pencil sharpener also makes noise and heats up. Which observation of the pencil sharpener demonstrates the law of conservation of energy?

• The amount of electrical energy used equals the total amount of mechanical, sound, and thermal energy produced.

• The amount of energy used by the electric pencil sharpener is greater than an electric lamp.

• The electric pencil sharpener only uses energy when it is being used to sharpen a pencil.

• The electric pencil sharpener is easier to use than the older version that was cranked by hand.

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How does sealing a house help in reducing heat loss?

• It prevents heat loss by radiation

• It stops heat loss by conduction

• It prevents heat loss by convection

• It increases heat loss by evaporation

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What is the role of foam seals around doors and windows?

• To allow air to pass through

• To prevent heat loss by convection

• To increase heat loss by conduction

• To make the house soundproof

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What is the purpose of having cavity walls in houses?

• To increase the weight of the house

• To reduce heat loss by conduction

• To allow more light into the house

• To make the house more spacious

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How does double glazing help in reducing heat loss?

• It allows more sunlight to enter

• It reduces heat loss by conduction

• It increases air circulation

• It makes the windows more transparent

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What is the main problem caused by friction in energy transfer?

• It increases the speed of objects

• It reduces the efficiency of energy transfer

• It makes objects more colourful

• It decreases the temperature of objects

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What is the primary cause of energy loss in electrical transmission lines?

• Resistance in the wires

• Magnetic fields around the wires

• Voltage drop across the wires

• Current flow through the wires