Energy Concepts and Calculations

Front

What is the law of conservation of energy?

Back

In a closed system, the total amount of energy remains constant over time; energy cannot be created or destroyed, only transformed.

Front

What is the transformation of energy in a toaster?

Back

Electric energy is transformed into thermal energy.

Front

What is an example of mechanical energy being transformed?

Back

Mechanical energy can be transformed into sound energy, such as when a guitar string vibrates.

Front

What is the standard international unit for energy?

Back

The joule (J) is the standard unit of energy.

Front

How does energy from the Sun reach Earth?

Back

Energy from the Sun travels to Earth through radiation.

Front

What is kinetic energy?

Back

Kinetic energy is the energy of an object in motion, calculated as 1/2 mv², where m is mass and v is velocity.

Front

What is potential energy?

Back

Potential energy is stored energy based on an object's position or state, such as gravitational potential energy.

Front

What is thermal energy?

Back

Thermal energy is the total kinetic energy of particles in a substance, related to temperature.

Front

What is the difference between conduction, convection, and radiation?

Back

Conduction is heat transfer through direct contact, convection is heat transfer through fluid movement, and radiation is heat transfer through electromagnetic waves.

Front

What is an example of energy transformation in a battery?

Back

A battery transforms chemical energy into electrical energy.