energy Flashcards
mechanical energy transfer
when energy from one energy store is transferred to another energy store by the action of a force.
electrical energy transfer
electricity can transfer energy from a power source, such as a cell, delivering It to components with a circuit
heating/thermal energy transfer
can be transferred by conduction, convection, radiation
radiation energy transfer
light and sound carry energy and can transfer this between two points
example of thermal energy
hot coffee cup warming up cold hands because the hot coffee transfers heat to the mug, the mug becomes hot and then the heat is transferred to the hands by thermal energy transfer.
what is an energy transfer
Energy cannot be created or destroyed, but it can undergo transformations from one form to another.
how do fruit batteries work
because some fruits contain citric acid. This acid participates in chemical reactions that make electrons flow, thus creating electricity. However, these fruit batteries have very little voltage, probably less than one volt. Most fruits have very little electrical current (amperage).
what is the relationship between the reactivity of metals in fruit batteries
Describe how to generate electricty in a power station
generators in a power station produce electricity when a coil of wire is changing magnetic field. the changing magnetic field is caused by spinning a magnet inside the coil
renewable energy sources
SOLAR ENERGY. Solar energy is the most abundant of all energy resources and can even be harnessed in cloudy weather. …
WIND ENERGY. …
GEOTHERMAL ENERGY. …
HYDROPOWER. …
OCEAN ENERGY. …
BIOENERGY.
non renewable energy sources
There are four major types of nonrenewable resources: oil, natural gas, coal, and nuclear energy. Oil, natural gas, and coal are collectively called fossil fuels.
fossil fuels
Fossil fuels were formed within the Earth from dead plants and animals over millions of years—hence the name “fossil” fuels.Oil, natural gas, and coal are collectively called fossil fuels.
advantages of using renweabe energy
Generating energy that produces no greenhouse gas emissions from fossil fuels and reduces some types of air pollution.
Diversifying energy supply and reducing dependence on imported fuels.
Creating economic development and jobs in manufacturing, installation, and more.
disadvantages of using renweabe energy
At the present time, most renewable energy generators are expensive to set up. Also, sources such as wind turbines and solar cells rely heavily on the weather. If it is not a windy day, wind turbines will not turn.
