Chapter 6 Flashcards
A magnet attracts
A magnetic field does not interact with a
stationary electric charge
moving electric charge
stationary magnet
a moving magnet
stationary electric charge
A neutral atom that gains one or more electrons is called a (an)
negative ion.
positive ion.
de-ionized atom.
positron.
negative ion.
A positive electric charge
attracts other positive charges
repels other positive charges
does not interact with other positive charges but only with negative ones
consists of an excess of electrons
repels other positive charges
A solid conductor is one
whose electrons are firmly bound in place
some of whose electrons are free to move about
which has no electrons
which has too many electrons
some of whose electrons are free to move about
An electric current is measured in units of
volt.
amp.
watt.
coulomb.
amp.
An atom consists of a
uniform distribution of positive charge in which electrons are embedded
uniform distribution of negative charge in which electrons are embedded
small negative nucleus surrounded at a distance by protons
small positive nucleus surrounded at a distance by electrons
small positive nucleus surrounded at a distance by electrons
An electric iron draws a current of 15 A when connected to a 120-V power source. Its resistance is
0.125 ohms
8 ohms
16 ohms
1800 ohms
8 ohms
Coulomb’s formula F = KQ1Q2/R2 gives the force between two charges in free space. The value of K
is the same under all circumstances
is different for positive and negative charges
depends on the masses of the charged particles
equals the charge on the electron
is the same under all circumstances
Electrical resistance is a property of conductors that is measured in units of
coulomb.
volt.
amp.
ohm.
ohm.
The current in a 24-W, 12-V light bulb is
0.5 A
2 A
12 A
288 A
2 A
The current in a 20-ohm electric heater operated at 240 V is
0.083 A
12 A
2880 A
4800 A
12 A
The power rating of an electric motor that draws a current of 3 A when operated at 120 V is
40W
360 W
540 W
1080 W
360 W
The resistance of a wire depends on
the length of the wire.
the cross-sectional area of the wire.
the temperature of the wire.
All of the above.
All of the above.
The unit of electric potential difference between two points is
an ampere.
a coulomb.
a joule.
a volt.
a volt.
The unit of electric charge is called a (an)
electron.
ampere.
coulomb.
ohm.
coulomb.
The voltage needed to produce a current of 12 A in a resistance of 20 ohms is
0.6 V
1.67 V
8 V
240 V
240 V
What is the resistance in a 24-W, 12-V light bulb?
0.5 ohms
2 ohms
6 ohms
24 ohms
6 ohms
Three 12-V batteries cannot be connected to give a voltage for the set of
6 V
12 V
24 V
36 V
6 V
Two 240-watt light bulbs are connected in parallel across a 120-V power line. The current in each bulb is
0.5 A
1.0 A
2.0 A
4.0 A
2.0 A
