# Electricity/Electronics

• Professional Engineer Review Course, Inc.
Part of the Chapman & Hall Professional Engineer Workbook Series book series (CHPEWS)

## Abstract

Electricity problems involve the behavior of voltage and current in an electrical system consisting of resistor, capacitor, and inductive components. Practical definitions of the more frequently used terms are:
• Current. I: A measure of the flow of electrical charges in a conductor, such as a wire, in ampere units.

• `: The quantity of current over a 1-sec period in Coulomb units (Q = I x t).

• Electromotive Force. EMF: A potential difference in the system that causes a current to flow in volt units (V).

• Resistance. R: A discrete element in an electrical system that opposes the flow of current in Ohm units.

• Capacitance. C: Property of a pair of conductors separated by an insulator (dielectric) in Farad units.

• Inductance. L: Property of a device, usually a coil of wire, that acts to oppose the flow of current by inducing in the device an opposing voltage, in Henry units.

• Energy. W: Considered as the amount of work a system is capable of doing measured in Joules (1 Joule = 1 Newton-meter; N-m).

• Power. P: Rate of doing work in watts (P = w/t) 1 watt = 1 Joule/sec.

• Horsepower, hp: One horsepower (hp) = 746 watts = 2546 Btu/hour.

• Efficiency: Defined as Power delivered to load/Power generated = P0/Pi x 100

• Gram-Calorie: Energy required to raise the temperature of 1 gram of water 1 degree centigrade.

• Mechanical Force: F (newtons) = mass (kg) x acceleration (m/sec2)

## Keywords

Direct Current Alternate Current Minority Carrier Voltage Gain Direct Current Motor
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

## Selected References

2. V. Del Toro, “Principles of Electrical Engineering,” Prentice Hall, Englewood Cliffs, NJGoogle Scholar
3. Stein and Hunt, “Electric Power System Components,” Van Nostrand Reinhold, New YorkGoogle Scholar
4. H. Milcaf, “Electricity One-Seven,” Hayden Publications.Google Scholar
5. W.R. Wellman, “Elementary Electricity,” D. Van Nostrand, New YorkGoogle Scholar
6. E. Norman Lurch, “Electric Circuits,” John Wiley & Sons, New YorkGoogle Scholar
7. E.K. Kraybill, “Electric Circuits for Engineers,” Macmillan, New YorkGoogle Scholar
8. D.F. Shaw, “An Introduction to Electronics,” John Wiley & Sons, New YorkGoogle Scholar