DC TEST STUDY MATERIAL

Which symbol is used for ohms of resistance?

Ω

A unit of energy is the:

Joule

Minute particles that make up all possible elements and still retain the unique chemical characteristics of the element are called:

atoms

A component whose value is measured in microfarads is a:

capacitor

Kirchoff's Voltage Law (KVL) states that the total voltage around a closed loop must be zero.

True

The pole of the magnet from which the flux leaves is called the _______ pole.

north

Safety precautions to be taken when working on high voltage equipment include which of the following?

All jewelry should be removed

Which metric prefix would be used to represent 1 x 10⁻³

Milli

An electron has:

a negative charge

Total power in a series circuit equals the:

sum of the power dissipated by each resistor

Invisible lines of force that surround a magnet are called:

magnetic flux lines

The basic unit of electric power is the:

watt

With three 4.5 kΩ resistors and one 1.5 kΩ resistor in parallel, the total resistance is:

750 Ω

The basic unit of length in the metric system is the:

meter

What two types of energy are used throughout electronics?

Kinetic and potential

Electrical direct current flowing in a wire produces a magnetic field:

parallel to the wire

Battery cells are connected in parallel to:

increase current capacity

Which class of fire extinguisher is used on oil fires?

Class B

When the resistance of a series circuit decreases, ____________.

total current increases

A material is magnetized when the:

domains are in alignment

If a series circuit has two 13 kΩ resistors with a source voltage of 10 V, the wattage is:

3.85 mW

What does the M+ key on a calculator do?

sums the quantity on screen to memory

The total current in a series-parallel circuit equals the:

circuit equals the:

sum of the parallel branch circuit current

The ammeter setting on a multimeter indicates what type of reading?

Current

In a series circuit, the current is _________.

the same in all parts of the circuit

_______ force produces magnetic flux.

Magnetomotive

A component whose value is measured in Ohms is a:

resistor

You should use caution when talking to someone who is operating electrical equipment because the distraction:

could damage the equipment
could ruin an electronic device
both could be injured

A material that can be magnetized easily falls into this category:

Ferromagnetic

It is dangerous to use wooden handle tools around high voltage due to their ability to absorb moisture.

True

Which metric prefix would be represented by 1 x 10¹²?

Tera

The output of a lead-acid cell is approximately:

2.1 V

If a short occurs in the parallel portion of a series-parallel circuit, how will the total resistance be affected?

It will increase

______ is a term used to describe voltage.

Electromotive force

In a parallel circuit, total resistance:

is less than the resistance of any branch

In a linear electrical circuit, voltage and current are:

inversely proportional

A molecule is the smallest particle of matter than exist by itself.

False

When an individual receives an electrical shock, an immediate symptom can be:

cardiac arrest

Watt's Law states that power is the product of current and voltage. Using algebra, how could the power be determined if resistance and current are known?

current squared times the resistance

Which of the following is commonly used to measure electrical energy consumption?

Kilowatt-hours

What happens as protective eye goggles age?

Their resistance to scratching decreases

The Wheatstone bridge can be used for precision measurement of:

resistance

A term used to describe opposition to current flow is:

resistance

The main purpose of a safety observer is to:

turn off equipment in use and apply emergency first aid or cardiopulmonary resuscitation if needed

With 70 volts applied to two 30 kΩ resistors in series connected to three 30 kΩ resistors in parallel forming a series-parallel circuit, what is the total current?

1 mA

In an electrical circuit where voltage and resistance are known, which form of Ohms Law is used to find the circuit current?

I=E/R

Ohms Law states that voltage is the product of resistance and current. Using algebra, how would you determine the resistance?

divide the voltage by the current

If a series circuit has a current of about 15.4mA and a source voltage of 20V, the total resistance is approximately:

1300Ω

A/an _____ stops the flow of current.

insulator

A decrease in the current of a series circuit can be caused by a:

resistance increase

Fuses are rated in maximum ____ and ____.

current, voltage

Which device would most likely include a light level meter?

camera

Battery cells are connected in series to:

increase voltage output

The most common functions of a generic multimeter are:

voltmeter, ammeter, ohmmeter

Switches are rated in maximum ____ and ___.

current, voltage

Digital multimeters eliminate which of the following disadvantages of analog meters?

Parallax errors

Given a battery rated at 200 ampere-hours, how many hours will the battery be able to provide 10 amperes?

20

Which prefix would be used to represent 1 x 10⁶?

Mega

A resistor with 68 +/- color bands of blue, gray, and black has a value of ________.

68 ohms at 20 percent

When two 10 kΩ parallel resistors are connected in series with a third 10 kΩ resistor, total resistance (RT) is:

15 kΩ

The current flowing in a circuit is directly proportional to the applied voltage and inversely proportional to circuit resistance. This is a statement of:

Ohm's Law

A/an _____ allows current to flow easily

conductor

The unit of measure for electron flow is a(n) _____.

ampere

The sum of voltage drops in a series circuit:

equals the applied voltage

The "triboelectric effect" causes what kind of electricity?

Static

Kirchoff's First Law is also known as the principle of conservation of electric charge. It states that at any point, the sum of currents flowing toward that point is equal to the sum of currents flowing away from that point.

True

In a simple parallel circuit, the voltage across each branch is ____.

equal to the source voltage

Thevenin's Theorem states that it is possible to simplify any circuit containing any amount of voltage sources, current sources, or resistance, no matter how complex, to an equivalent circuit with just a single voltage source and series resistance connected to a load.

True

The Law of Static Electrical Charges states:

like charges repel

In order to eliminate possible fire hazards, rags should be stored in:

metal containers

A basic atom must contain what two types of subatomic particles?

electron and proton

When resistors are added in parallel to a parallel circuit, total current:

increases