Engineering and Tech Expo

source: http://www.ndsu.edu/career/engineering_tech_expo/

Wednesday, September 21, 2011
10 a.m. - 3 p.m.
Fargodome

The NDSU Engineering & Tech Expo is an annual event attended by employers from many engineering and technology-related industries. The expo provides an excellent opportunity to connect with students to discuss or interview for current and/or future career-related employment and co-op/internship opportunities. Last year 110 employers and 1365 students took part in this event.

The Expo is open to NDSU students and alumni and current students from Minnesota State University Moorhead Construction Management and Industrial Technology departments. The Expo is NOT open to the general public.

Advertising Sponsors

Individuals with disabilities are invited to request reasonable accommodations to participate in NDSU-sponsored programs and events. To request an accommodation(s), please contact the Career Center at 701-231-7111 .

Electric Car Battery's Record Range of 280 Miles Per Charge

Alternator

How alternators work

http://www.familycar.com/Classroom/charging.htm

Video - What is a diode?

http://youtu.be/MVy_MG0X2h4

Volts, Amps, Ohms

The three most basic units in electricity are voltage (V), current (I) and resistance (r).

Definitions:

V = Voltage (Volts)

I = Current (Amps)

R = Resistance (Ohms)

P = Power (Watts)

Analogy:

Plumbing pipes.

voltage <-> water pressure
increase the pressure in the tank -> more water come out of the hose.
increase the voltage -> more current flow.

resistance <-> pipe size.
increase the diameter of the hose -> more water come out of the hose.
decrease the resistance in an electrical system -> which increases the current flow.

In either cases you increase the water flow rate or current flow

Electrical power is measured in watts.
P = VI
Take a hose and point it at a waterwheel like the ones that were used to turn grinding stones in watermills. You can increase the power generated by the waterwheel in two ways.

1) increase the pressure of the water coming out of the hose, it hits the waterwheel with a lot
more force and the wheel turns faster, generating more power.

2) If you increase the flow rate, the waterwheel turns faster because of the weight of the extra water hitting it.

Ohms Law

V=IR

I=V/R

R=V/I

Power

P=VI

Assuming DC

AC calculations introduce something called the "power factor"or Phase shift between Voltages and Currents.

source:
http://www.idc-online.com/technical_references/pdfs/electrical_engineering/Volts_Amps_and_Ohms.pdf