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Energy Transfer and Transform
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What is the unit of power?
Watt, W
What does power measure?
How fast energy is transferred
What energy transfer happens when food is used by the body?
Chemical energy to kinetic energy and heat energy
What energy transfer happens in a hair dryer?
Electrical energy to heat energy and kinetic energy
What energy transfer happens in a lamp?
Electrical energy to light energy and heat energy
What energy does wind have before it turns a turbine?
Kinetic energy
What useful energy does a wind turbine produce?
Electrical energy
What useful energy does a phone screen produce?
Light energy
What useful energy does a motor produce?
Kinetic energy
What useful energy does a heater produce?
Heat energy
Is wasted energy destroyed?
No
What happens to wasted energy?
It is transferred to something else
What type of energy is produced when something vibrates?
Sound energy
What type of energy does a battery provide in a circuit?
Electrical energy
What type of energy does the Sun give us?
Light energy, heat energy
What type of energy does a hot object transfer to cooler objects?
Heat energy
What type of energy is stored in a stretched rubber band?
Elastic potential energy
What type of energy does a book on a high shelf have?
Gravitational potential energy
What type of energy does a moving car have?
Kinetic energy
What is the formula for efficiency?
useful energy Ă· total energy Ă— 100%
What does a Sankey diagram show?
Energy transfers, useful energy, wasted energy
What does “wasted energy” mean?
Energy transferred in a less useful way
Can energy be created or destroyed?
No, only transferred
What wasted energy does a lamp often produce?
Heat energy
What useful energy does a lamp produce?
Light energy
What type of energy is produced by a speaker?
Sound energy
What type of energy is carried by an electric current?
Electrical energy
What type of energy is stored in food and fuel?
Chemical energy
What is elastic potential energy?
Energy stored in a stretched or compressed object
What two things increase gravitational potential energy?
More mass and more height
What is gravitational potential energy?
Energy stored by an object lifted above the ground
What happens to kinetic energy if an object moves faster?
It increases
What is kinetic energy?
Energy of a moving object
What is the unit of energy?
Joule, J
Energy of moving objects is known as __________.
kinetic energy
_____________ is a source of light that was developed by scientists.
flashlight
Sound energy is caused due to the __________ of objects.
vibration
Chemical energy of gasoline gets transformed into __________ energy.
kinetic and heat
Energy stored in gasoline is __________ energy.
chemical
_______________ energy is involved when objects are bent.
(Elastic) Potential energy
The ability to do work or cause a change is known as _____________>
energy
The stored energy of an object at rest is known as_______________.
Potential energy
The form of energy that we can hear ___________.
sound energy
The form of energy that we can see is known as ____________.
light energy
The transformation of energy when dominoes fall is from __________ to __________.
potential to kinetic
The way in which thermal energy flows as waves is known as ____________.
Radiation
The energy stored in food, gasoline or chemicals.
chemical energy
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