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How do diodes work?

A diode is an electrical component in a circuit. It only allows electricity to flow in one direction. It can be used to change a current from alternating to direct.
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Answered by Samuel A. • Physics tutor
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¿Cuál es tu opinión de Facebook?

A mi parecer, Facebook controla demasiadamente la vida de mucha gente, y de muchas maneras. Por ejemplo, crea la presión social, en forma de mostrar fotos de los demás divirtiéndose. Los psicólogos han hecho...
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Answered by Miles R. • Spanish tutor
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Solve algebraically: 6a+3b=24, 3a-b=7

Equation 1 : 6a+3b=24Equation 2: 3a-b=7 Rearrange equation 2 to make b the subject:add b to both sides : 3a=7+bminus 7 from both sides: 3a-7=b Substitute this into Equation 1 : 6a + 3(3a-7)=24 Multiply out t...
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Answered by Emily G. • Maths tutor
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Find the coordinates of the stationary points of the curve 3x=y+6x+3

First, straight away from reading the question you know this question will involve differentiating the function with respect to x so immediately you want to re-write the equation in terms of y which in this ...
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Answered by James S. • Maths tutor
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The equation of line L1 is y=4x+3, The equation of line L2 is 4y-16x-2=0, Show that these two lines are parallel.

The equation of a line is shown in the form y=mx+c to prove that two lines run parallel you must prove that they have the same gradient or value of 'm', the number before x. The first equation L1 is already ...
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Answered by Sophie C. • Maths tutor
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