Do this now…Go to http://

tinyurl.com/SAFETY-ACTIVATOR and complete the pre-lesson survey.

Go to my eBoard and set up your Quia account with the “Quia Instructions” note under the Electronics 1 tab. I will give you your username and

password to enter onto the website on a 3x5” index card.

You must use this information.Your email address is:

studentID#@lrstudents.orgShow your blank desktop and help the

people in your row when you’re done.

Safety Precautions and Practices

Safety is an attitude.The inside of human body is built to move

electricity. What does your nervous system do?

Our skin keeps us safe from low voltage shock, up to 40 volts. Think of voltage as electrical potential energy.

Electrical current kills. Current is the flow or movement of electricity.

Electrical ShockElectrical shock occurs when an electric current

flows through the body when a complete circuit exists.

Electrical ShockDifferent levels of current produce the following

results: 0.001 Ampere

A mild tingling sensation that can be felt. 0.010 Ampere

Start to lose muscular control. 0.030 Ampere

Breathing becomes upset and labored. 0.100 Ampere

Death if the current lasts for more than a second 0.200 Ampere

Severe burns, breathing stops. Death.

Factors that influence the effects of electric shock:

Intensity of the current.Frequency of the current.Current path through the body.Length of time current passes through the

body.High moisture in the room and on your body.Remember, it is the amount of current flow

through the body, not the amount of voltage contacted that determines the severity of a shock.

General Safety Precautions

Remove power from the circuit or equipment prior to working with it

Remove and replace fuses only after the power to the circuit has been de-energized.

Make sure all equipment is properly grounded.Use extreme caution when removing or

installing batteries containing acid.

General Safety Precautions

Use cleaning fluids only in well-ventilated spaces.

Dispose of cleaning rags and other flammable materials in tightly closed metal containers.

In case of an electrical fire, de-energize the circuit and report it immediately to the appropriate authority.

Electrostatic Discharge (ESD)

Static electricity is an electrical charge at rest on a surface.

Electrostatic discharge takes place when the charged body comes near or touches a neutral surface.

A surface can become charged through three means:1. Friction, rubbing two dissimilar surfaces

together.2. Induction, transferring a charge from your

body to a board wrapped in plastic for someone else to handle.

3. Capacitance, changing the relative voltage of an integrated circuit by changing the surface it rests on.

Preventing ESD1. Treat all electronic components and circuits as

static sensitive.2. Do not touch the leads, pins, or components of

printed circuit board traces.3. Before handling a component or circuit,

discharge yourself by touching a grounded metal circuit.

4. Keep components in original packing materials until needed.

5. Never slide static components over any surface.

Personal Safety Precautions

Work only in clean, dry areas.Do not wear loose or flapping clothing.Wear only nonconductive shoes.Remove all rings, wristwatches, bracelets, ID

chains, and similar metal items.

Personal Safety Precautions

Do not use bare hands to remove hot parts.Use a shorting stick to remove high-voltage

charges on capacitors.Make certain that the equipment being used is

properly grounded with polarized plugs.Remove power to a circuit prior to connecting

alligator clips.

Hand Tools Always use the proper tool for the job, right type and size. When carrying tools, always keep the cutting edge down. Keep hands clean when using tools. Avoid grease, dirt, or oil

on hands when using any tool. Clamp small pieces when using a hacksaw, screwdriver, or

soldering iron. Keep metal rules clear of electrical circuits. Disconnect all electrical devices by pulling directly on the

plug, never the cord. Cut one wire at a time to avoid damaging the cutting tool. NEVER USE A TOOL WITHOUT A RUBBER HANDLE

Power ToolsJust reading this slide does not qualify you to operate a

machine! You must have individual training with the instructor.

Only the operator starts or stops a machine. When stopping a machine, wait until it comes to a complete stop before leaving the machine.

Make all adjustments to the machine prior to turning it on.

Never have any loose hand tools, rags, or brushes in the work area when applying power.

Keep all safety guards in their proper position at all times.

Power ToolsJust reading this slide does not qualify you to operate a

machine! You must have individual training with the instructor.

Never force a cutting or drilling tool into a work-piece.

Only one person in the work zone at all times power is applied.

Have instructor check any special setups prior to applying power.

Use only grounded power tools with three-prong plugs or UL-approved housing power tools.