Electricity

Electrical wires with second layer of coating has

• circuit breaker

• fuse

• earthing

• double insulation

• Residual Current Device

What is an example of a good insulator?

• wood

• copper wiring

• stones

• concrete floor tiles

Tags

NGSS.MS-PS3-3

You probably use the term heat many times a day. As an example, when you cook dinner, you heat your dinner on a hot stove. When you place a piece of cool metal in the sun, it is heated by the sun’s energy. Why is heat the correct term to use in these examples?

• They show that when objects are touching, they are the same temperature.

• They show that heat flows from something warmer to something cooler.

• They indicate that heat is created to raise the termperature of something.

• They indicate that the kinetic energy of the particles decreases when something is heated.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-3

Click the statement that is true.

• Thermal energy transfers from the cooler object to the warmer object.

• Thermal energy transfers from the warmer object to the cooler object.

• Thermal energy does not transfer at all.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

A student likes to attend football games, no matter how cold and snowy the weather becomes. She is going to a game on a very cold day and takes along a hand warmer. She activates it and tucks it into the glove she is wearing. She holds her hands together, and before long, her hands are warm. Which best describes how her hands were warmed?

• Heat was transferred by conduction, resulting in an increase in kinetic energy.

• Heat was transformed by convection, resulting in the conservation of energy.

• Thermal energy was transferred by currents, resulting in an increase in kinetic energy.

• Heat was transformed by radiation, resulting in an increase in kinetic energy.

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

When food is cook in a microwave, radiation is giving off through what scientific concept?

• Boyle's Law

• Charles' Law

• The Law of Conservation of Mass

• Electromagnetic Spectrum

Tags

NGSS.MS-PS4-2

A student gets ready to go to school one day, and he finds out that his car's battery is dead. The headlights will not come on, and the car won’t start. What transformations usually happen when the battery is active and the headlights come on?

• chemical → electrical → light

• electrical → kinetic → light

• light → electrical → chemical

• thermal → electrical → light

Tags

NGSS.MS-PS3-5

True or false? Conduction involves DIRECT CONTACT between two objects?

• True

• False

What is not an example of thermal expansion

• A hot air balloon rising in the air

• A cold sidewalk on a winter day.

• A bag of popcorn cooking in the microwave

• A hot dog cooking on a grill

Tags

NGSS.MS-PS1-4

What is happening when a balloon's kinetic energy decreases and it gets smaller?

• Expansion

• Desolation

• Radiation

• Contraction

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4