Introduction to Energy
What are the two categories of energy?
Potential and kinetic
What is heat energy moving through a solid?
Conduction
When energy moves from one location to another
Energy transfer
What are the three components of a circuit?
Energy source (battery), wires, load
True or false: objects can be 100% efficient
False
What is energy stored in objects when they are stretched?
Elastic energy
Materials which do not allow energy (heat or electricity) to pass through them?
Insulators
Burning wood: transfer or transformation?
Transformation
Which subatomic particle is involved in electricity production?
Electrons
Identify the main unit used to measure amounts of energy
Joules
What is potential energy?
Stored energy
What is heat transfer in liquids and gases?
Convection
Energy changing from potential to kinetic within the same object
Energy transformation
What is an open circuit?
A circuit with a break in the conductive path (energy cannot flow through)
A speaker transforms electrical energy into sound energy. Identify one type of energy that is wasted.
Heat/Light
What is energy caused by vibrating particles in air?
Sound energy
The measure of mass per unit of volume
Density
What is the law of conservation of energy?
The term used to describe the movement of electrons around a circuit.
Current
What is useful energy?
Energy used to serve an object's main purpose
What are the four types of potential energy?
Gravitational, nuclear, elastic, chemical
In what form does heat radiate from the sun?
As a wave
Draw 3 transformation diagrams for energy use in light bulbs
Electrical -> light, electrical -> heat, electrical -> sound
What is a series circuit?
All components of the circuit are joined in one loop
A fridge uses 450J worth of energy. 90J of energy are used to keep the light inside the fridge working. What is the % of energy efficiency?
80%