LEARNING RESOURCES
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Significant figures
Significant figures are what we call all those digits in a number that are known for sure (or for which there is a some certainty).
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Sensitivity of an instrument
One of the qualities of measuring instruments is their sensitivity. A measuring instrument is more sensitive the smaller the quantity that it is able to measure.
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Scientific notation
La notación científica consiste en escribir el resultado de una medición como un producto con dos partes: un número entre 1 y 10 y una potencia de 10.
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Scales of observation
The material world which our eyes cannot observe is known as the microscopic scale of observation (cells, atoms, molecules, etc.)
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s/t, v/t and a/t graphs
Concept of s/t, v/t and a/t graphs
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s/t and v/t graphs of a URM
Which is going faster? The s/t and v/t graphs together or separately.
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s/t, v/t and a/t graphs of a UCM
The s/t , v/t and a/t graphs for circular movements are analogous to those for rectilinear movements.
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r.p.m. and r.p.s.
The speed of an MCU can be expressed in rpm and in rps (revolutions per minute and revolutions per second).
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Rounding a measurement
The result of a measurement should be consistent with the measuring instrument used. How to round: you must already understand the degree of precision in the result of a measurement.
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Reflection
When an undulatory movement comes across an obstacle which prevents its propagation and does not absorb its energy, the waves change direction, they are reflected.
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Resistors in series
Here is a circuit with two resistors connected in series, a voltmeter and an ammeter.
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Resistors in parallel
Two resistors connected in parallel. Here is a circuit which has two resistors connected in parallel, a voltmeter and a ammeter.
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Residual current circuit breaker (RCCB)
The residual current circuit breaker (RCCB) is one of the elements of a consumer unit. The following visual explains its function.
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Representative value
The representative value of a series of measurements is the one which we think is closest to the real value of the said measurement.
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Representation of forces
Forces are represented by means of vectors. A vector is an oriented sector. The following animation representes the characteristics of a vector.
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Renewable energy sources
Renewable energy sources are those which after being used can be regenerated naturally or artificially. The following pictures are graphic examples rof enewable energy sources.
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Relativistic paradox
If at relativistic speeds bodies decrease in length, would it be possible to shut a large rocket which was travelling at the speed of light in a hangar? The answer to this question constitutes a "relativistic paradox".
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Relative movement of the Earth
The educational resource shows a visual about the relative movement of the Earth: our planet is enormous compared to a train, which is why although all the earth moves, it seems to us to be still, and the sky around it the one that moves.
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Relative error
The relative error of a measurement is the quotient between the absolute error of the measurement and its real value.
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Refraction
Imagine that a wave passes from a deeper zone to another shallow zone, or vice versa. There will be refraction.
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