DC ELECTRICITY Midterm

The size of a power drill is based on the maximum diameter of the ______________________________.

Chuck

Which type of fire extinguisher should be used on a grease fire?

Class K

Mixtures of two or more elements are called ______________________________.

Compounds

The part of a circuit that carries the flow of electrons is referred to as the ____.

Conductor

The theory that states that electrons flow from positive to negative is called the

Conventional

The unit of measurement of an amount of electrical charge is the _____.

Coulomb

Electrical ______________________________ is the flow of electrons.

Current

If a cable must be laid across a pathway, and the pathway cannot be blocked, the cable should be taped to the floor with ______________________________ tape.

Duct

Which letter is commonly used to represent voltage when using Ohm's law?

E

Abnormal surge in electrical current

Electrical Fault

Discharge of electrical current passing through your body

Electrical Shock

A negative charge is exhibited by the ____ of the atom.

Electron

The theory that states that electrons flow from negative to positive is called the ____ theory.

Electron flow

The field of force surrounding a charged body is called the ____.

Electrostatic Field

A water extinguisher is appropriate for use on a Class B fire.

False

True or False? A resistance path from hand to hand will be higher than from hand to foot.

False

True or False? An antistatic mat should be used when working on an antistatic workbench

False

True or False? An atom displays a negative charge when there are more protons than electrons.

False

True or False? Best practices recommend that you lift with your back.

False

True or False? Direct current flows in both directions.

False

True or False? In a circuit consisting of a lamp attached to the terminals of a battery with copper wire, the battery is the load.

False

True or False? Static discharge occurs when two objects are at the same static voltage level.

False

True or false? A volt-ohm-milliammeter (VOM) usually has high input resistance on the lowest voltage range.

False

True or false? An atom is the smallest part of a compound that still retains all of the characteristics of that compound.

False

True or false? Meter loading is common in highly sensitive meters.

False

True or false? Polarity is a common issue when using a digital meter.

False

True or false? The D'Arsonval movement can be observed on a DMM when taking measurements.

False

True or false? The law of charges states that like charges attract.

False

True or false? When an object is charged by induction, the object takes on the same charge as the rod.

False

A screw is an example of a ____.

Fastner

Which type of ladder is recommended when working around electricity?

Fiberglass

Provides a safe path for fault current

Grounding

The infinity symbol is used to represent ____.

Highest resistance level

Which letter is commonly used to represent current when using Ohm's law?

I

Examples include earplugs, gloves, and safety glasses

PPE

What effect will an electric shock involving a current of 15 mA have?

Pain with sustained muscle contraction

A circuit that provides multiple paths for electrons to follow is called a(n) ______________________________ circuit.

Parallel

Voltage is also referred to as ______________________________ difference.

Potential

A positive charge is exhibited by the ____ of the atom.

Proton

A positive meter terminal is typically represented by the color ____.

Red

The opposition to the flow of electrons is called

Resistance

The degree of change that must take place before a meter will display the new value is ____.

Resolution

The first section on a safety data sheet provides which information?

Restrictions on use of the product

Insulated ______________________________ gloves are worn inside leather protector gloves to provide protection from electric shock.

Rubber

A material that limits, but does not stop, the flow of electrons is called a(n) ____.

Semiconductor

Meter quality and the percentage of error in a meter reading are determined by the meter's ____.

Sensitivity

What is the purpose of a driver screen in a work van?

To protect the driver from falling equipment

True or False? A minimum ground fault current can be in excess of 10,000 amps

True

True or False? A negative meter terminal is typically represented by the color black.

True

True or False? A resistor can remain dangerously hot after the power is turned off.

True

True or False? An electrostatic precipitator can be used to reduce pollution by attracting negatively charged pollution particles to positively charged collection plates.

True

True or False? Non-GFCI power outlets can be used with a single GFCI-style circuit breaker

True

True or False? Silver is a good conductor of electrical energy.

True

True or False? The goal of CPR is to provide oxygen to the brain until paramedics arrive to take over.

True

True or false? A field-effect transistor-VOM can be used to measure decibel ratings.

True

True or false? A series circuit has only one path for current flow.

True

True or false? A volt-ohm-milliammeter can be used to measure resistance.

True

True or false? If an ohmmeter has a knob marked with an omega (Ω) symbol, that knob is used to adjust the pointing needle.

True

True or false? Sand is an example of an insulator

True

An ionized atom is electrically ____.

Unbalanced

The three main parts of an electrical circuit are the ____.

Voltage, source, load

Electrical pressure is measured in ____.

Volts

The atomic ______________________________ of an element indicates the approximate number of protons and neutrons in the nucleus.

Weight

Induction occurs when _____.

a charged body is near another object

What are the two types of electrical current?

direct and alternating

A grounded device has a ____ potential

0 volt

A current of ____ amperes will be produced when a 1200 Ω resistor is connected to a 6 V source.

0.005

A current of ____ amperes will be produced when a 12 Ω resistor is connected to a 6 V source.

0.5

A meter with a resolution of 1/1,000 can measure a voltage as small as ____.

1 millivolt

A coulomb represents 6.24 × ____ electrons.

1018

A current of ____ amperes will be produced in a circuit consisting of a 4 Ω resistor connected to a 12 V source.

3

OSHA recommends that when using an extension ladder, it be positioned so that it extends at least ____ past the point of contact on the structure.

3 feet

Most employers restrict their employees to a maximum lift of ____ pounds.

50

The NEC requires all electrical systems of ____ or higher to be grounded.

50 Volts

The symbol ~ on a meter represents ____.

Alternating current

Electrical current is measured with a(n) ____.

Ammeter

Current is generally measured in ____.

Amperes

An atom displays a positive charge when it loses ____.

An electron

The two major types of meters are ____ and digital.

Analog

How long should you flush the eyes when using an emergency eyewash station?

At least 15 minutes

The term static means ____.

At rest

Which room in a dwelling is most likely to require ground-fault circuit protection

Bathroom

The type of electrical diagram that groups components in stages and shows how an overall system works is a(n) ____ diagram.

Block

A Class ______________________________ fire extinguisher is designed to be used on fires involving energized electrical equipment.

C

The negative terminal on a meter is also referred to as ____.

COM

Meters commonly change AC voltage into DC by using a ____.

Capacitor

A(n) ____ diagram used primarily in industrial processes to illustrate operation and how controls relate to each other.

Line

Digital meters typically use ____ displays.

Liquid crystal

Prevents accidental startup of a machine or system while maintenance is being done

Lockout Tagout

Although a voltmeter is connected in parallel with a component for measuring, ____ are placed in series with a voltmeter in order to measure higher voltages.

Multiplier resistors

Which organization produces the National Electrical Code?

National Fire Protection Agency (NFPA)

The ohmmeter uses the ____ scale, which has unevenly spaced markers

Nonlinear

Protons and neutrons comprise the ______________________________ of the atom.

Nucleus

A(n) ____ requires the use of a battery installed in the meter.

Ohmmeter

Electrical resistance is measured in ____.

Ohms

A good conductor has ____.

One outer ring electron

Class 1 gloves have a(n) ______________________________ label.

White

A ____ is commonly used to tighten and loosen bolts.

Wrench

The electrostatic field surrounding an object ____.

can be either positive or negative

An ammeter is always connected ____.

in series with the device to be measured