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How can a MOSFET be used as a switch?

A MOSFET is a semiconductor device that can be used as an electronic switch or an amplifier. Some of its critical parts are the gate, source, drain, substrate and oxide insulator. Consider an n-channel enhan...
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What is homeostasis? Describe using an example.

Homeostasis can simply be described as the maintenance of a constant internal environment. Human bodies must get rid of accumulating toxic substances which can harm the body. Things like sugar concentration ...
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Answered by Tasneem S. • Biology tutor
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Sam uses 140g of flour to make 12 cakes. How much flour will Sam need to make 21 cakes?

140 / 12 = 11.666^. 11.66^. * 21 = 245
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Answered by Charlie N. • Maths tutor
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A sample of hydrochloric acid has a pH of 2.34. 
Write an expression for pH and calculate the concentration of this acid.

pH = -log([H+]) Therefore, 10^(-pH) = [H+] [H+] = 4.57x10^-3
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Answered by Charlie N. • Chemistry tutor
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Explain the flow of ions during an action potential of a typical neurone

There are numerous ionic fluxes during an action potential, which involves depolarisation, repolarisation and hyperpolarsation. During depolarisation, voltage-gated sodium ion channels open. In turn, sodium ...
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Answered by Annie S. • Biology tutor
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