Discuss this Gallery 4

on May 7, 2014

#2 D 1891 by William Morrison of Des Moines
#3 B Ohm´s Law
#4 A 1mA DC @100V to 100000 body resistance
#5 D on the Fox River Appleton 30 Sept 1832
#6 C
#7 B only in United States
#8 C as a merge of AIEE /1884) and IRE (1912)
#9 B
#10 B

on Jun 2, 2014

Keep these quizzes coming. This is great stuff to teach apprentices to see where we've come from.

on Aug 7, 2014

I'll take issue with 5mA being the threshold of sensation for men, too. I teach this stuff and virtually every reference I've ever seen puts it at around 1mA for men and a bit less for women. It's also why UL puts a leakage current limit of 0.75mA on listed 2-prong appliances. Personal experience also bears this out. At 5mA, you will definitely want to let go as soon as possible! And at 5mA arm-to-arm, breathing can be arrested in some sensitive people. Someone needs to take fact-checking a bit more seriously at EC&M!

on Jan 26, 2016

This is an excellent topic. It would be interesting to look at what you may have documented. Were your test assessments done at 120V to ground or 240V phase-to-phase?

Please or Register to post comments.

Electrical Testing Feed

EC&M Webinars
Jul 26, 2016
Sponsored

Data-Driven Decisions Through Smart Building Technology – How IoT Impacts Facility Professionals

The Internet is this generation’s industrial revolution. It continuously creates new opportunities and impacts our facilities across every industry. One important example is how IoT has impacted facility operations through integration and accessibility of many of the building systems. Much like the convergence of IT and Telecom into VoIP, the internet has the capability to align facilities and IT to create a Smart Facility....More
Jul 28, 2016
Sponsored

Next Generation Lighting- The Emergence of POE for Lighting

Historically, lighting controls have always had a singular responsibility: Manage the light. Until now....More
EC&M Learning Center

Connect With Us

Sponsored Introduction Continue on to (or wait seconds) ×