25 Tips You Need To Know About Current Electricity Engineering

1. The curve representing Ohm's law in linear.
2. The condition in Ohm's Law is that the temperature should remain constant.
3. The Ohm's Law can be applied with certain reservations to electrolytes.
4. The presence of an electric current is made known by the effects produced.
5. An electric current can neither be seen nor touched.
6. Three important effects produced by the presence of a current heating, magnetic and electric shock.
7. Thermistor has negative coefficient of resistance.
8. International ohm is defined in terms of resistance of a column of mercury.
9. Resistors commonly used in power circuits are wire wound resistors.
10. When current flows through a heater coil it glows but the supply wiring does not glow because the resistance of heater coil is more than that of supply wires.
11. If the voltage applied across an electric press is reduced by 50 percent, the power consumed by the press will be reduced by is 25 percent.
12. In a parallel circuit the potential difference across the resistance is always constant.
13. In a series circuit the current is constant.
14. Voltage applied across a circuit acts as a force.
15. The resistance of carbon filament in carbon-filament lamps increases when its temperature is decreased.
16. The heating effect of current has an undesirable side effect in a vacuum cleaner.
17. When current flows in a conductor, the heat is produced because of inter atomic collision.
18. The temperature coefficient of a conductor is defined as the increase in resistance per ohm pwer degree centigrade.
19. The value of Joule's mechanical equivalent of heat,is equal of 4.2 Joules per calorie.
20. It was experimentally found by James Precott Joule that the heat produced in a current carrying conductor is proportional to the square of current.
21. The resistance of a conductor increases when its temperature is increased.
22. The specific resistance, depends upon the nature of the material of the conductor only.
23. Resistance of a conductor increases when its length increases.
24. The resistance of conductor is the hindrance by which the conductor opposes the flow of the current.
25. The minimum requirements to cause the flow of current are a voltage source and a conductor

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ELECTRICAL FORMULAS

Air Coil Winding Chart
Complete from inductance in microhenries, Number of Turns etc.

Antenna Introduction Basic
Antennas formulae with problem and solution. Real antennas are different, however, and do not
have an ideal radiation distribution. Energy varies with
angular displacement and losses occur due to sidelobes.


Antenna Formulas
With terms and calculations. This terms is traditionally tied to the recieve antenna factor, the
ratio of field strength at the location of the antenna to the output voltage across the load connected to the antenna.


Standard Antenna
Terms and Related Formulas, A surface, near or on an
antenna, on which it is convenient to make
assumptions regarding the field values for the
purpose of computing fields at external points.


BJT Formula Summary
For the pnp device, reverse the directions of all current labels and reverse
the order of subscripts involving node


Cable Design Equations—Coaxial Cable Formulae
Coax cable capacitance, coax cable velocity of propagation, time delay, impedance, cut off frequency,


Coaxial Transmission Lines
Electrical Properties, Relative propagation velocity, Capacitance, Maximum operating frequency, Peak power rating, RF peak voltage


Electromagnetic Relationships and Formulas
Impedance (for an inductor), Core Constant, Inductance L, Attentuation, Magnetic Field Intensity (H), Magnetic Flux Density (B), Inductance (L), Quality Factor (Q)


Inductance Calculation Techniques
Approximations and Handbook, In the second part of this two parts series on inductance calculation techniques, approximation techniques and handbook methods


Antenna Circuit Design for RFID Applications
Passive RFID tags utilize an induced antenna coil
voltage for operation. This induced AC voltage is
rectified to provide a voltage source for the device. As
the DC voltage reaches a certain level, the device
starts operating.


Microstrip Line Impedances
Dielectric Constant, Effective Dielectric Constant.


Complete electronics Formulas and fundamentals
Antenna,Radar Equations, Radar and receiver characteristics and test, Microwave rf components, Electro optics and IR, Aircraft dynamics considerations,
Data transfer busse.


Engineering Reference - Equations
Voltage Reflection Coefficient, Effective Aperature Related to Gain of Antenna, Characteristic Impedance of Free Space, Friis Transmission Equation.


Voltage Standing Wave Ratio
When a transmission line is terminated with an impedance, ZL, that is not equal to the characteristic impedance of
the transmission line, ZO, not all of the incident power is absorbed by the termination.