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Originally meant also as part marking code, this shorthand notation is widely used in electrical engineering to denote the values of resistors and capacitors in circuit diagrams and in the production of electronic circuits (for example in bills of material and in silk screens).
A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. In electronic circuits, resistors are used to reduce current flow, adjust signal levels, to divide voltages , bias active elements, and terminate transmission lines , among other uses.
87V - Voltage Differential; 87Z - High-Impedance Differential; 88 - Auxiliary Motor or Motor Generator; 89 - Line Switch; 90 - Regulating Device; 91 - Voltage Directional Relay; 92 - Voltage And Power Directional Relay; 93 - Field-Changing Contactor; 94 - Tripping or Trip-Free Relay; 95 – Trip Circuit Healthy; 96 – Transmitter
For example, if a 300-ohm resistor is attached across the terminals of a 12-volt battery, then a current of 12 / 300 = 0.04 amperes flows through that resistor. The ohm (symbol: Ω) is the SI unit of electrical resistance, named after Georg Simon Ohm. An ohm is equivalent to a volt per ampere.
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Ripple voltage in the output of a good DC power supply [9] 75 mV Nerve cell resting potential [10] Deci-10 −1: 320 mV Typical voltage reference level in consumer audio electronics (0.316 V rms) [11] ~500 mV Typical MOSFET threshold voltage for modern processes [12] ~700 mV Forward voltage drop of normal silicon diodes [13] 800–1000 mV
The first character group is a number representing the heater voltage rounded to the nearest whole number; 0 indicates a cold-cathode tube. [1] One or two letters assigned to the devices in order of development. A single numeral that represents the number of active elements in the tube. Suffix letters distinguish revisions or variants:
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