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Electricity > Student safety 2011 5th edition - Pt 1 - Pg 1-5 > Flashcards

Student safety 2011 5th edition - Pt 1 - Pg 1-5 Flashcards

https://drive.google.com/file/d/1mQ5Wk9Wum3EO2lnTtReSaqh-vwCxBy1_/view?usp=sharing

1
Q

What does “energized” mean in electricity?

Pg 2

A

electrically connected to/have voltage source

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2
Q

What does “exposed” mean in electricity?

Pg 2

A

(applied to energized electrical conductors) capable to be inadvertently touched nearer than a safe distance by a person. A term applied to circuit parts not suitably guarded, isolated or insulated

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3
Q

What does “externally operable” mean in electricity?

Pg 2

A

capable to be operated without exposing the operator to contact with energized electrical conductors or circuit parts

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4
Q

What does “in operation” mean in electricity?

Pg 2

A

a term to describe a lab

A lab is in operation if it meet these conditions:

  • power is on in a workstation
  • students are wiring/troubleshooting equipment/circuits/staff are setting up or troubleshooting equipment or circuits
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5
Q

What’s a safety eyewear?

Pg 2

A

safety glasses meeting current standards for low impact eye
protection, which must have side shields

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6
Q

What’s a safety footwear?

Pg 2

A

any CSA approved footwear bearing the green triangle

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7
Q

What’s a circuit?

Pg 2

A

A path that can, for example, result if you turn on a flashlight, electricity flows from its batteries to the lamp and back to batteries.

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8
Q

What’s the amount of electricity flowing called?

Pg 3

A

current

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9
Q

What’s the amount of electricity flowing in a circuit measured in?

Pg 3

A

amps

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10
Q

Current flows in a circuit due to the voltage supplied by what?

Pg 3

A

the power source (battery, power supply)

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11
Q

If a circuit’s voltage increases the current also…?.

Pg 3

A

…increase

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12
Q

Circuits that are connected to a voltage source are
described as what?

Pg 3

A

alive/live

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13
Q

When you become part of a circuit, current goes through and you get _______.

Pg 3

A

When you become part of a circuit, current
through and you get shocked.

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14
Q

When you become part of a circuit means you are connected it circuit in _ different places.

Pg 3

A

When you become part of a circuit means you are connected it circuit in 2 different places.

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15
Q

What’s does the “ground” refers to in electricity?

Pg 3

A

The “ground”
refers to the planet and any metal connected to it.

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16
Q

Plumbing pipes, heating ducts and metal building structures are all ________.

Pg 3

A

Plumbing pipes, heating ducts and metal building structures are all grounded.

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17
Q

Touching that’s grounded and a part of the circuit that is live to ground will result in what?

Pg 3

A

Touching that’s grounded and a part of the circuit that is live to ground will result in a shock.

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18
Q

What’s a main factor to determine a shock’s severity?

Pg 3

A

the amount of current

19
Q

Shock currents are often measured in what?

Pg 3

A

in milliamps (mA)

20
Q

a milliamp is ________ (1/_) of an amp?

Pg 3

A

a milliamp is thousand (1/1000) of an amp

21
Q

What does proportional mean?

Pg 3

A

corresponding

22
Q

True or false?
Current is not proportional to voltage

Pg 3

A

False.
Since current is proportional to voltage, higher voltages lead to worse shocks

23
Q

What’s the lowest distribution voltage that utilities use?

Pg 4

A

2,400-9,000 volts

24
Q

Is the lowest distribution voltage that utilities use life threatening?

Pg 4

A

Yes, at
this voltage any direct contact is life threatening.

25
Q

Pure water is a poor conductor of electricity.
Most water, including in the body, has dissolved ions that make us better conductors.

Pg 4

A
26
Q

True or false? Dry skin has relatively high resistance against current.

Pg 4

A

true

27
Q

Despite a skin’s high resistance, what’s beneath can still make us a good electricity conductor?

Pg 4

A

Our skin’s tissue beneath is mostly water.
Even a tiny break in the skin creates a low resistance path makes a shock worse.

28
Q

True or false?
It’s safe to wear metal wristband and Why?

Pg 4

A

false
A metal wristband makes a big contact area and makes a shock worse.

29
Q

What can the skin’s initial burning and blistering lower resistance cause?

Pg 4

A

It cause more intense shock, burning, and blistering.

30
Q

True or false? Even a tiny current through the chest affect our ability to breath or the heart to beat.
Current through your brain can be fatal.

Pg 4

A

true

31
Q

True or false?
Up to 1 mA we can feel a shock.

Pg 4

A

false
Up to 1 mA we usually can’t feel a shock.

32
Q

True or false?
At ~8 mA people feel a shock without injury.

Pg 4

A

true

33
Q

What does GFCI stand for?

Pg 4

A

Ground Fault Circuit
Interrupters

34
Q

What’s GFCI used for and what at opened at how much mA?

Pg 4

A

GFCIs can protect others in high risk areas like bathrooms, opened at 5 mA.

35
Q

Currents above what mA cause burns?

Pg 5

A

Currents +100 mA cause burns.

Most source states 100 mA, but the Student Safety book states 10 mA.

36
Q

True or false?
~10-20 mA won’t include 1st and 2nd degree burns.

Pg 5

A

false
~10-20 mA include 1st and 2nd degree burns.

37
Q

What can above 10-20 mA cause to the body?

Pg 5

A

What can above 10-20 mA cause to the body?

38
Q

Why can’t we let go of what’s electrocuting us?

Pg 5

A

loss of muscle control
A shock’s current may cause muscle to contract and “freeze”, one cannot let go even at will.

39
Q

What’s the max current an average person can grasp and “let go”

Pg 5

A

Average people can grasp and “let go” at a max of 16 mA.

https://www.ccohs.ca/oshanswers/safety_haz/welding/electric.html#section-2-hdr

40
Q

What can 20 mA do to muscles?

Pg 5

A

20 mA may cause muscles for breathing to be paralysed.

41
Q

What happens to a body at 100 mA?

Pg 5

A

At 100 mA ventricular fibrillation occurs–heart stops pumping.

42
Q

What happens to a body at 200 mA?

Pg 5

A

Over 200 mA the heart muscles clamp. There is damage to internal organs.

43
Q

Smallest circuit breaker or fuse used to protect power circuits in buildings of how much amps and did they offer protection against shocks?

Pg 5

A

Smallest circuit breaker or fuse used to protect power circuits in 15 amps buildings, but offer no protection against shocks.

Electricity (5 decks)

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