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28 Cards in this Set
- Front
- Back
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Alpha Radiation |
A radioactive emission with low penetrating power, which can be blocked by paper. |
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Acceleration |
The rate of change of velocity, acceleration depends on the mass of the object and the force applied. |
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Alternating Current (A.C.) |
An electric current that constantly changes direction. |
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Ammeter |
A device which measures current in series and parallel circuits, measured in amperes (A). |
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Ampere (A) |
The unit of electric current. |
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Amplitude |
The maximum displacement from the mean position in a transverse wave. In sound it is the measure of the loudness of the sound. |
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Attraction |
A force, which occurs between two charged objects if they have dissimilar charges, for example 'positive and negative' (coming together force) |
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Background |
Some radioactivity occurs naturally from for example space or rocks and is described as 'background' radioactivity. |
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Balanced in electricity |
In electricity when there is an equal number of positive and negative charges present on an object. |
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Balanced |
When two things for example forces are equal, so they cancel each other out. |
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Beta |
A radioactive emission with moderate penetrating power can be blocked by thin sheets of aluminium. |
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Big Bang |
The accepted theory of how the Universe began, which states that all matter was created in an explosion from a single point in space at a single time, the matter was thrown outwards and has continued to travel outwards ever since. |
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Biofuel |
Energy sources derived from recently living organic matter for example biodiesel is made from vegetable oils and animal fats and can be used in some cars. Bioethanol is produced from the fermentation of some crops for example corn or sugarcane. |
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Cancer |
A malfunction of the human body where growths of undifferentiated tissue occurs which can be malignant and fatal, often linked with radioactivity. |
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Charges |
These are either positive or negative; they exert forces on one another. If an object is 'charged' then it has a set of charges. |
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Chemical Form of energy |
things which release energy as a result of a chemical reaction, for example burning of a fuel, respiration of food in the body, or the chemicals in a battery. |
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CMBR Cosmic microwave background radiation |
radiation present in the universe and left over from the big bang, used as evidence to support the big bang. |
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Components |
A part of an electrical circuit, for example the bulbs or switch or diode. |
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Compression |
A place on a longitudinal wave where the density is the maximum. For example, in sound waves where the air is the least spread out. |
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Compression |
Solid objects can be compressed (squashed) if forces are applied to them. |
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Condensation |
When a vapour turns to a liquid on cooling, heat is given out during this change. |
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Conduction |
When heat energy is moved because the vibrating particles in a solid conductor pass it on, metals are the best conductors. |
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Conservation |
Describes the importance of saving or restricting the use of an important resource, such as the non-renewable energy sources. |
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Convection |
When heat energy is moved because of the movement of more energetic particles in liquids and gases. |
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Current |
Electric current is the flow of electrons or ions. |
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Data logger |
Electrical computer equipment used to measure and record information such as temperature, sound levels, pH and oxygen levels. |
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Diffracted |
This word describes the circular bending of waves when they pass through a small gap. |
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Diode |
A component, which lets electric current pass through in only one direction. |
