ABSTRACT The experiment deals with determining the standard reduction potentials of different electrochemical half-cells through pairing it with Cu2+(0.1 M)|Cu half-cell and then comparing it with the theoretical value. Galvanic or voltaic cells contain the anodic and cathodic cell reactions‚ and in order to get the value of Ecell‚ we add both half-reactions. The more positive the Ecell‚the more negative ΔG would be‚ thus‚ giving us a spontaneous reaction. After comparing the cell potentials
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of voltaic cell‚ redox reaction is occurred. The redox reaction gives rise to 2 different half equations. The metal that is placed higher in the electrochemical series is the reducing agent‚ hence causing electron to loss. This electrode acts as an anode. Conversely‚ metal that is placed lower in the electrochemical series is the cathode and acts as an electron acceptor. Presence of different variables: Independent variables: Different pair of metals as electrodes Pairs of metals Magnesium and Silver
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Power Electronics * The control and conversion of electrical power by power semiconductor devices (wherein these devices operate as switches) * To control and convert electrical power from one form to another * Power range: from a few VA/Watts to several MVA / MW * The primary task of power electronics is to process and control the flow of electric energy by supplying voltages and currents in a form that is optimally suited for user loads. Interdisciplinary Nature of Power
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SCR‚ the wave shape of the voltage obtained from UJT firing circuit is a a) Sine wave (b) saw tooth wave (c)trapezoidal wave (d) Square wave 2. In a thyristor circuit‚ the angle of conduction can be changed by changing (a) anode Voltage (b) Anode Current (c) Forward Current rating (d)gate Current 3. Freewheeling diodes are mainly used for (a) Better utilization factor (b) di/dt protection (c) Quick turn on (d) None 4.The value of dc load voltage for a 1-( semi converter
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oxidation‚ and the other gains electrons‚ which is called reduction. The metal being oxidized is called the anode‚ and the one being reduced is the cathode. The entire arrangement of anode‚ electrolyte‚ cathode and conductor is called a galvanic cell. If the metals are then connected outside of the solution by an electrical conductor like a wire‚ a current of electrons will flow in the wire from the anode to the cathode. Inside the solution‚ positively charged ions from the oxidizing metal will migrate to
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is a four-layer‚ three-junction and a three-terminal device and is shown in fig.a. The end P-region is the anode‚ the end N-region is the cathode and the inner P-region is the gate. The anode to cathode is connected in series with the load circuit. Essentially the device is a switch. Ideally it remains off (voltage blocking state)‚ or appears to have an infinite impedance until both the anode and gate terminals have suitable positive voltages with respect to the cathode terminal. The thyristor then
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which are condensed vapour cooled ceramic tetrodes. In the old generation transmittes‚ triodes are used in the PA‚ modulator and exciter stages. Both the tetrodes and triodes tubes are capable of being operated at high voltages (11 kV DC) and large anode current of the order of 50 Amps. They also draw large filament current of about 620 Anps at 24 volt CQK-350. Hence the tubes dissipate large amount of power which require effective cooling. The CQK series of transmitting tubes are tetrode specially
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Lithium ions move from the anode to the electrolyte and finally to cathode when they are being consumed‚ and travel reversely when being recharged. Lithium ions also go through an oxidation process which allows them to reduce the time it takes to recharge the battery by 10times. I
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Chemistry Exam Revision - Redox & Electrochemical Series - Define oxidation and reduction in term of loss and gain of oxygen; loss and gain of electrons and change in oxidation state (number). • Oxidation is the loss of electrons; an increase in oxidation state or a gain in oxygen by a molecule‚ atom‚ or ion. • Reduction is the gain of electrons; a decrease in oxidation state or a loss of oxygen by a molecule‚ atom‚ or ion. • OIL RIG (Oxidation is Loss‚ Reduction is Gain) - Rules for assigning
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emanating rays into a nearby anode with a hole in it. The electrons are accelerated from the cathode‚ focused into a helix‚ through the hole in the anode (at positive potential—creating an electric field)‚ thus emerging with kinetic energy‚ K‚ equal to the product of the electron’s charge‚ e‚ and the voltage‚ V (potential difference). Assuming they are emitted with negligible energy‚ where m is the mass of the electron‚ in this case. After emerging from the hole in the anode‚ the electrons enter a region
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