DC unit 1 & 2 test

An electrical circuit has a voltage of 50 v and a resistance of 5 ohms. what is the value of the current

10 A

An electric circuit has a resistance of 20 ohms. The current is measured to be 6A. how many volts are applied to the circuit

120

A toaster is listed as 1560 W. When it is plugged into a 120 V circuit and starts to make toast, how many amperes will it draw?

13

The effects of static electricity (electric charges) were noticed by the greeks about _______ years ago.

2500

An electrical device is listed as 3,000 watts. Approximately how many horsepower is this

4

An electrical motor is running on 120 V. The current is measured to be 2A. How many volts are applied to the circuit

60

If a circuit is open, current _______ flow

will not

There are two types of electrical sources; one of them is AC; the other is

DC

Direct current is described as

unidirectional

part of an atom that has a negative charge

electron

The unit of electrical "pressure" that causes current flow to flow is called the

volt

The unit of electromotive force is the

volt

The three principle parts of an atom are

electron, neutron, proton

Electricity is the flow of

electrons

Matter can exist in 2 states; solid and liquid

false

the grounding conductor is one of the two conductors through which normal circuit current flows.

false

the ungrounded conductor is one of the two conductors through which normal circuit current flows.

false

A semiconductor is normally an atom with ________ electrons in the valance shell

four

The unit of electrical power is the

watt

The neutral conductor is also referred to as the ________ conductor

grounded

An opposition to current flow that occurs in alternating current circuits is called

impedance

The speed of travel of electricity in a conductor is _______ the speed of light

less than

The most common method of producing electricity is through the use of

magnetism

Electron current flow theory considers electricity to be the flow of charge carriers which are __________ in polarity

negative

part of an atom with no charge

neutron

The nucleus of an atom contains

neutrons and protons

The unit of resistance is the

ohm

The statement "current is directly proportional to voltage and inversely proportional to resistance" is known as _______ law

ohm's

A conductor is normally made of atoms with ________ electrons in the valance shell

one to three

The valance shell of an atom is the ________ shell

outermost

Valance electrons are contained in the _________ shell

outermost

Conventional current flow theory considers electricity to be the flow of charge carriers which are ___________ in polarity.

positive

The part of an atom that has a positive charge

proton

The atomic number of an element is the number of _______ in the nucleus

protons

Objects with like electrical charges

repel

The law of charges states that like charges ________ and opposite charges _________

repel, attract

Objects charged with the same type of charge will push each other away. This is referred to as

repulsion

Opposition to current flow is called

resistance

An insulator is normally an atom with __________ electrons in the valance shell

seven or eight

In a circuit, when the two conductors leading from the power source touch metal-to-metal, this is called a _________ circuit

short

Matter has mass and occupies space

true

Voltage does not flow, but is the "pressure" that makes current flow .

true

the grounded conductor is one of the two conductors through which normal circuit current flows.

true

Current that flows in only one direction is called unidirectional. It is also referred to as _______ current.

direct

What is the term for an amount of charge equal to 6.25 x 10^18 electrons

coulumb

There are two types of electrical sources; one of them is DC; the other is

AC

Current that flows in both directions is called bidirectional. It is also referred to as ________ current.

Alternating

The force of electrostatic attraction or repulsion is directly proportional to the product of the two charges and inversely proportional to the distance between them. This is _______ law.

coulumb's

A flow of one coulomb past a point in a circuit describes a(n)

ampere

An element cannot be chemically subdivided into other elements. The smallest amount of an element is a(n)

atom

Objects with opposite electric charges

attract

Objects charged with different types of charges will draw toward each other. this is referred to as

attraction

Alternating current is described as

bidirectional

In order to have current flow, a circuit must be

closed