This packet is intended for use in a seminar after the students have a basic knowledge of electric circuits, voltage, resistance, and flow of electric current.

Time for presentation is estimated as 45 - 60 minutes.

Objectives:

To present some of the factors that should be considered in order to prevent electric shock when electrical equipment is to be used.

This packet includes the following items:

· Lecture material for the instructor (Powerpoint File)
· Overheads for use during the lecture (Powerpoint File)
· Handouts for the students (Powerpoint File)
· Homework problems

Preview the Lecture material, Overheads, and Handouts

Download the Homework Problem in a printable Adobe Acrobat Format (pdf).

Download the PowerPoint Presentation and notes

Homework problem solutions, exam problems, and exam solutions are available to qualified recipients. Send an email with request information to Dr. Donald Bloswick.

Electrical Safety Assignment

Purpose: To gain an understanding of electric shock, how it affects humans and how it can be prevented.

A worker at a construction site, with his left hand, grabs an electric cord connected to an old 220-volt cement mixer. Over years of use, the insulation on the cord has deteriorated and the worker is shocked. The worker is standing in a puddle and the current flows through both legs.

Assume the following resistance:
Hand 1000 W
Internal body 600 W
Each wet foot 400 W

1. Calculate how much current is flowing through the workers body?

2. What effect will this much current probably have on the workers body?

3. What may have caused the insulation on the electric cord to deteriorate?

4. How would a 1 5-amp fuse have affected this accident?

5. How would a GFCI have helped to prevent this accident?