In order for there to be a flow of charge from one place to another, there must be a
a. conductor, such as a wire, connecting the two places.
b. potential difference between the two places.
Both A and B above
100
In solid conductors, electric current is the flow of
electrons
100
Compared to thin wires, electrical resistance in thick wires is
less.
100
For most conductors, as their temperature increases, their resistance
increases.
200
If two negative charges are held close together and then released, the charges will
move away from each other
200
Suppose a hollow metal sphere has a large negative charge on it. The electric field strength inside the sphere is
zero.
200
Electric power is defined as
current times voltage.
200
Current from a battery is always
DC.
200
Electrical resistance is measured in
ohms.
300
Electrical potential energy is the energy a charged object has because of its
location.
300
When an 8-V battery is connected to a resistor, 2 A of current flows in the resistor. What is the resistor's value?
4 ohms
300
The current through a 5-ohm resistor connected to a 150-V power supply is
30 A.
300
How much power is used by a 12.0-V battery that draws 0.5 A of current?
6 W
300
A volt is a unit of
electric potential.
400
A small, positively charged object near a positively charged sphere is moved closer to the sphere. The electrical potential energy of the small object will
increases.
400
Who is the best science teacher?
Mr. Dang
400
If you walk into a region of space and suddenly feel a force, the space is said to contain a
force field.
400
Electrical potential energy per charge is electric
potential.
400
The primary reason a bird can perch harmlessly on bare high voltage wires is that
there is no potential difference across the bird's feet.
500
A 2-C charge experiences a force of 40 N when put at a certain location in space. The electric field at that location is
20 N/C
500
A 5-C charge is located near a positively charged sphere so that it has 50 J of electric potential energy. Its electric potential is
10 V.
500
When we say an appliance uses up electricity, we really are saying that
electron kinetic energy is changed into heat and other forms of energy.
500
If you use 17J of work to push a charge into an electric field and then release the charge, as the charge flies past its starting position, its kinetic energy is