Physical Science Chapter 6

Electrostatic charge results from

transfer or redistribution

The unit of electric charge is the

coulomb

An electric field describes the condition of space around

a charged particle

a material that has electrons that are free to move throughout the material is a

electrical conductor

An example of an electrical insulator is

glass

The electrical potential difference between two points in a circuit is measure in units of

volt

The rate at which an electric current flows through a circuit is measured in units of

amp

The law that predicts the behavior of electrostatic forces acting through space is

coulomb’s law

What type of electric current is produced by fuel cells and solar cells?

dc

The electrical resistance of a conductor is measured in units of

Ohm

According to Ohm’s law, what must be greater to maintain the same current in a conductor with more resistance?

voltage

A kilowatt-hour is a unit of

work

If you multiply volts by amps, the answer will be in units of

power

Units of joules per second are a measure called a

watt

A lodestone is a natural magnet that attracts

all of the above

The North pole of a suspended or floating bar magnet currently points directly toward Earth’s

north magnetic pole

A current-carrying wire always has

a magnetic field with closed concentric field lines around the length of the wire

Magnetism is produced by

moving charges

Earth’s magnetic field

has undergone many reversals in polarity

The strength of a magnetic field around a current-carrying wire varies directly with the

amperage of the current

Reverse the direction of a current in a wire, and the magnetic field around the wire will

have a reversed north pole direction

The operation of which of the following depends on the interaction between two magnetic fields?

all of the above

An electric meter measures the

strength of a magnetic field

When a loop of wires cuts across magnetic field lines or when magnetic field lines move across a loop of wire,

electrons are pushed toward one end of the loop

A step-up transformer steps up the

voltage

Electromagnetic induction occurs when a coil of wire cuts across magnetic field lines. Which one of the following increases the voltage produced?

increased strength of the magnetic field

Electric power companies step up the voltage of generated power for transmission across the country because higher voltage

reduces the current, which lowers the energy lost to resistance

a solar cell

produces electricity directly

Which of the following is most likely to acquire an electrostatic charge?

electrical nonconductor

Which of the following units are measures of rates?

amp and watt

You are using which description of a current is you consider a current to be positive charges that flow from the positive to the negative terminal of a battery?

conventional current

In an electric current, the electrons are moving

at a very slow rate

In which of the following currents is there no electron movement from one end of a conducting wire to the other end?

alternating current

If you multiply amps by volts, the answer will be in units of

power

A permanent magnet has magnetic properties because

the magnetic domains are aligned

A current-carrying wire has a magnetic field around it because 

a moving charge produces a magnetic field of its own

When an object acquires a negative charge, it actually

gains mass

A positive and a negative charge are initially 2 cm apart. What happens to the force on each as they are moved closer and closer together? The force

increases while moving

To be operational, a complete electric circuit must contain a source of energy, a device that does work, and 

a conductor from the source to the working device and another conductor back to the source

Which variable is inversely proportional to the resistance?

cross-sectional area of a conductor

Which of the following is not considered to have strong magnetic properties?

silver

A piece of iron can be magnetized or unmagnetized. This is explained by the idea that

Atoms of iron are grouped into tiny magnetic domains that may orient themselves in a particular direction or in a random direction

Earth’s magnetic field is believed to originate

with electric currents that are somehow generated in Earth’s core

Electromagnetic induction takes place because

electrons have their own magnetic field, which interacts with an externally applied magnetic field

The current in the secondary coil of a transformer is produced by a 

varying magnetic field

An electromagnet uses

an electric current to produce a magnetic field

A tranformer

changes the voltage of an alternating current

A parallel circuit has

separate pathways for the current to flow through

In which type of circuit would you expect a reduction of the available voltage as more and more resistances are added to the circuit?

series circuit

In which type of circuit would you expect the same voltage with an increased current as more and more resistances are added to the circuit?

parallel circuit