Semiconductor SAQ

The resistivity is between that of a good conductor and a good insulator.

The resistance decreases with an increase in temperature.

Electrons gain energy and break bonds, allowing for current to flow.

<p>A space or gap left behind when an electron breaks free.</p> Signup and view all the answers

<p>Electrons flow in one direction, and positive holes flow in the other direction.</p> Signup and view all the answers

<p>Intrinsic conduction is the movement of charges through a pure semiconductor with equal numbers of electrons and holes, while extrinsic conduction is the movement of charge through a doped semiconductor.</p> Signup and view all the answers

<p>The purpose of doping a semiconductor is to increase its conductivity by adding small amounts of another element to a pure semiconductor.</p> Signup and view all the answers

<p>N-type semiconductors add more free electrons available for conduction, while P-type semiconductors add more free positive holes available for conduction.</p> Signup and view all the answers

<p>A thermistor is an electrical component whose resistance decreases rapidly with increasing temperature.</p> Signup and view all the answers

<p>Doping can increase the number of free electrons or holes in a semiconductor, depending on the type of doping material used.</p> Signup and view all the answers

<p>To allow current to flow in one direction only</p> Signup and view all the answers

<p>It decreases rapidly</p> Signup and view all the answers

<p>The region at both sides of a p-n junction that contains no free majority charge carriers, behaving as an insulator.</p> Signup and view all the answers

<p>The potential difference that exists across a p-n junction, caused by holes and electrons moving across the junction when it is formed.</p> Signup and view all the answers

<p>The p-type region is doped with an excess of holes, while the n-type region is doped with an excess of electrons.</p> Signup and view all the answers

<p>A diode in a rectifier is used to convert a.c. to d.c. It achieves this by allowing current to flow in one direction, when connected in forward bias, and blocking it in the other direction, when connected in reverse bias.</p> Signup and view all the answers

<p>When connected in forward bias, a diode allows current to flow once the junction voltage is exceeded, whereas when connected in reverse bias, it acts as an insulator and does not allow current to flow.</p> Signup and view all the answers

<p>An LED emits light when it is connected in forward bias, due to the energy released at the p-n junction.</p> Signup and view all the answers

<p>The main function of a rectifier is to convert a.c. to d.c., which it achieves by using diodes to block or allow current flow in one direction.</p> Signup and view all the answers

<p>When a diode is connected in forward bias, it can conduct electricity, whereas when connected in reverse bias, it acts as an insulator and cannot conduct electricity.</p> Signup and view all the answers

<p>Boron</p> Signup and view all the answers

<p>Silicon</p> Signup and view all the answers

<p>The junction voltage is the voltage required to allow current to flow through a diode connected in forward bias.</p> Signup and view all the answers

<p>When the biasing changes from forward to reverse, the current flow through a diode changes from allowing current to flow to not allowing current to flow.</p> Signup and view all the answers

<p>A diode in a rectifier converts alternating current (AC) to direct current (DC) by allowing current to flow in one direction, and it achieves this by being connected in forward bias during the positive half-cycle and in reverse bias during the negative half-cycle.</p> Signup and view all the answers