electronics

Master diodes, transistors & logic gates! Electronics worksheet for high school physics.

1. When a reverse bias is applied to a diode, it will Increase the number of majority carriers. Decrease the number of majority carriers. Lower the potential barrier. Raise the potential barrier. 2. Which of the following statements describe how a photodiode interacts with photons? Valence electrons absorb energy from the photons and thus are able to move from the valence band to the conduction band. After absorbing energy from photons, the band gap decreases because conduction band moves towards the valence band. After absorbing energy from photons, the band gap decreases because valence band moves towards the conduction band. Electrons in conduction band absorb energy from photons and thus are able to move faster. 3. In the given circuits, identify the correct bridge rectifier arrangement. Draw the energy band diagrams for n-type and p-type semiconductors by showing two differences between them. Diagrams can be inserted by uploading an image of picture drawn at your foolscap sheet in the answer area below. In the following p-n-p transistor, identify the smallest and the largest current? Are there any two currents that are close in magnitude? If YES, then name them. A transistor is a three terminal device which is widely used as an amplifier.a. Mention the direction of current IB, IE and Ic on the circuit shown above and write Transistor’s current equation.b. Which layer of transistor has greatest concentration of impurity?c. For normal operation of transistor which junction should be forward biased?d. Draw the schematic symbols for npn and pnp transistor. Diagrams can be inserted by uploading an image drawn at your foolscap papers. Logic gates are the basic building blocks of any digitalsystem. It is an electronic circuit having one or more than one input and only one output. The relationship between the input and the output is based on a certain logic. Based on this, logic gates are named as AND gate, OR gate, NOT gate etc. A truth table shows each possible input combination to the gate or circuit with the resultant output depending upon the combination of these inputs. In Logic Functions 0 represents lowand 1 represents high .A logic gate AND gives high when each input is high .A logic gate NOTgives an inverted outputA logic gate XOR gives high when each input is at different level.A logic gate OR gives high when any of input is highA logic gate AND gives lowwhen both inputs are lowA logic gate XNORgives high when all inputs are at same level.A logic gate NOR gives low when any of input is high AND GATE OR GATE NOT GATE