NS Gr 7 T12

Infrared Thermography is ..

• a graphical representation of heat

• an accurate measurement of temperature

• a photographic representation of heat

What's the hottest element in this image?

• Cockpits

• Track

• Tires

• Wall

The image shows a hot water tank made of copper. Copper has a higher thermal conductivity than most metals. How does the rate of energy transfer through copper compare with the rate of energy transfer through most metals?

• Higher

• Lower

• The same

The tank is insulated. When the water is hot, the immersion heater switches off. Compared to a tank with no insulation, the rate of energy transfer from the water in an insulated tank is _____________________ . This means that the water in the insulated tank stays _____________________for longer.

• lower ; hotter

• higher ; hotter

• lower ; colder

• higher ; colder

What sort of heat transfer has allowed this image to be formed?

• conduction

• convection

• radiation

The electric kettle shown is used to boil water. Why is the total energy input to the kettle higher than the energy used to heat the water?

• Energy is absorbed from the surroundings.

• Energy is used to heat the kettle.

• The kettle is more than 100% efficient.

A student investigated the properties of three types of insulation. In the investigation different insulating materials were placed in contact with the hot metal plate. Temperature probes measured the temperature on each side of the material. The temperature probes were connected to a data logger. The image shows how the temperature measured by the insulated temperature probe changed over 10 minutes for each of the materials. Which material is the best insulator?

• A

• B

• C

The law of conservation of energy states that when one form of energy is converted into another,

• energy is destroyed in the process
• no energy is destroyed in the process
• energy is created in the process
• some amount of energy cannot be accounted for

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Heat energy is also called ______ energy.

• chemical

• electrical

• mechanical

• thermal

Tags

NGSS.HS-PS3-4

The process of energy changing from one form into another

• efficency
• law of conservation of energy
• energy transformation
• thermal energy

Tags

NGSS.MS-PS3-3

NGSS.MS-PS3-4

NGSS.MS-PS3-5