Previous Lecture 1
... have different energy level. Shells are represented by either 1,2,3...or K,L,M... Number of electrons in each shell=2n^2 Valance Shell and Valence Electrons Ionization: positive & negative ions If an electron absorbs a photon with sufficient energy, it escapes from the ...
... have different energy level. Shells are represented by either 1,2,3...or K,L,M... Number of electrons in each shell=2n^2 Valance Shell and Valence Electrons Ionization: positive & negative ions If an electron absorbs a photon with sufficient energy, it escapes from the ...
Experiment - TerpConnect
... called a diode. A diode consists of a junction of two semiconductor materials, called “n-type” and “p-type”, in which the degree of mobility of the electrons is different. When the materials are brought together, electrons will drift from one material to the other, and the equilibrium condition resu ...
... called a diode. A diode consists of a junction of two semiconductor materials, called “n-type” and “p-type”, in which the degree of mobility of the electrons is different. When the materials are brought together, electrons will drift from one material to the other, and the equilibrium condition resu ...
L25.ppt - University of Iowa Physics
... What is DC (direct current) ? • With DC or direct current the current always flows in the same direction • this is the type of current you get when you use a battery as the voltage source. • the direction of the current depends on how you connect the battery • the electricity that you get from the ...
... What is DC (direct current) ? • With DC or direct current the current always flows in the same direction • this is the type of current you get when you use a battery as the voltage source. • the direction of the current depends on how you connect the battery • the electricity that you get from the ...
Electric current - University of Iowa Physics
... What is DC (direct current) ? • With DC or direct current the current always flows in the same direction • this is the type of current you get when you use a battery as the voltage source. • the direction of the current depends on how you connect the battery • the electricity that you get from the p ...
... What is DC (direct current) ? • With DC or direct current the current always flows in the same direction • this is the type of current you get when you use a battery as the voltage source. • the direction of the current depends on how you connect the battery • the electricity that you get from the p ...
![L 25 Electricity and Magnetism [3] Electric current (symbol I](http://s1.studyres.com/store/data/007903713_1-7c777a1a37e6fccaeb2ed3a9724ccb92-300x300.png)
Chapter 20-21 Test Review Chapter Summary 20.1. Current • Define
... • Draw a circuit with resistors in parallel and in series. • Calculate the voltage drop of a current across a resistor using Ohm’s law. • Contrast the way total resistance is calculated for resistors in series and in parallel. • Explain why total resistance of a parallel circuit is less than the sma ...
... • Draw a circuit with resistors in parallel and in series. • Calculate the voltage drop of a current across a resistor using Ohm’s law. • Contrast the way total resistance is calculated for resistors in series and in parallel. • Explain why total resistance of a parallel circuit is less than the sma ...
L25.ppt - University of Iowa Physics
... What is DC (direct current) ? • With DC or direct current the current always flows in the same direction • this is the type of current you get when you use a battery as the voltage source. • the direction of the current depends on how you connect the battery • the electricity that you get from the ...
... What is DC (direct current) ? • With DC or direct current the current always flows in the same direction • this is the type of current you get when you use a battery as the voltage source. • the direction of the current depends on how you connect the battery • the electricity that you get from the ...
L25.ppt - University of Iowa Physics
... What is DC (direct current) ? • With DC or direct current the current always flows in the same direction • this is the type of current you get when you use a battery as the voltage source. • the direction of the current depends on how you connect the battery • the electricity that you get from the ...
... What is DC (direct current) ? • With DC or direct current the current always flows in the same direction • this is the type of current you get when you use a battery as the voltage source. • the direction of the current depends on how you connect the battery • the electricity that you get from the ...
IALP 2011 – Analog Electronics
... Generally speaking, voltages and currents can change with time. This is what we call AC ('alternating current', which stands for sinusoidal signals both current and voltage), for example the sinusoid V(t) = V0 sin (2π f t) with f the frequency of the signal and t time. ...
... Generally speaking, voltages and currents can change with time. This is what we call AC ('alternating current', which stands for sinusoidal signals both current and voltage), for example the sinusoid V(t) = V0 sin (2π f t) with f the frequency of the signal and t time. ...
De Morgan`s laws
... Both of these gates have 2 inputs and 1 output. A larger number of inputs are possible (see later). The NOT gate or inverter consists of a single input and the output is the opposite or complement of the input ...
... Both of these gates have 2 inputs and 1 output. A larger number of inputs are possible (see later). The NOT gate or inverter consists of a single input and the output is the opposite or complement of the input ...
P2 6.7 Mains electricity summary questiions
... c) i) An electric current is a flow of charge. ii) When charge flows through a resistor, electrical energy is transferred as heat. iii) Charge ...
... c) i) An electric current is a flow of charge. ii) When charge flows through a resistor, electrical energy is transferred as heat. iii) Charge ...
16spMid1Csoln
... equation IB=I0 VA3/2 ln VB in the region of operation with VA and VB between 2 and 10V. a. Write an expression for the transconductance in terms of IB and VA gm = 3/2 IB/VA ...
... equation IB=I0 VA3/2 ln VB in the region of operation with VA and VB between 2 and 10V. a. Write an expression for the transconductance in terms of IB and VA gm = 3/2 IB/VA ...
TRIAC
TRIAC, from triode for alternating current, is a genericized tradename for an electronic component that can conduct current in either direction when it is triggered (turned on), and is formally called a bidirectional triode thyristor or bilateral triode thyristor.TRIACs are a subset of thyristors and are closely related to silicon controlled rectifiers (SCR). However, unlike SCRs, which are unidirectional devices (that is, they can conduct current only in one direction), TRIACs are bidirectional and so allow current in either direction. Another difference from SCRs is that TRIAC current can be enabled by either a positive or negative current applied to its gate electrode, whereas SCRs can be triggered only by positive current into the gate. To create a triggering current, a positive or negative voltage has to be applied to the gate with respect to the MT1 terminal (otherwise known as A1).Once triggered, the device continues to conduct until the current drops below a certain threshold called the holding current.The bidirectionality makes TRIACs very convenient switches for alternating-current (AC) circuits, also allowing them to control very large power flows with milliampere-scale gate currents. In addition, applying a trigger pulse at a controlled phase angle in an AC cycle allows control of the percentage of current that flows through the TRIAC to the load (phase control), which is commonly used, for example, in controlling the speed of low-power induction motors, in dimming lamps, and in controlling AC heating resistors.