1
Created by Boundless
Ohm's law relates current (I) to voltage (V) as:
A
, where R is radiancy
B
, where R is radical
C
, where R is resistance
D
, where R is reaction
2
Created by Boundless
Ohmic circuits have current­voltage plots that are
A
linear and pass through the origin
B
linear and do not pass through the origin
C
not linear and pass through the origin
D
not linear and do not pass through the origin
3
Created by Boundless
When a superconductor is placed in a weak external magnetic field and
A
warmed above its transition temperature, the magnetic
field is attracted
B
cooled below its transition temperature, the magnetic
field is attracted
C
warmed above its transition temperature, the magnetic
field is ejected
D
4
cooled below its transition temperature, the magnetic
field is ejected
Created by Boundless
When cooled below a critical temperature, superconductor will exhibit
A
zero electrical resistance and expel magnetic field
B
non­zero electrical resistance and attract magnetic field
C
zero electrical resistance and attract magnetic field
D
non­zero electrical resistance and expel magnetic field
5
Created by Boundless
Resistance and resistivity describe the extent to which an object or material
A
changes in volume in response to an electric current
B
impedes the heat flow
C
changes in volume in response to a temperature change
D
impedes the flow of electric current
6
Created by Boundless
Resistivity is an
A
depends on the shape of an object
B
intrinsic property of a material
C
extrinsic property of a material
D
depends on the mass of an object
7
Created by Boundless
The resistance of an object depends on
A
All of these answers
B
the material
C
the length
D
the cross­sectional area of a resistor
8
Created by Boundless
Resistivity and resistance depend on temperature with the dependence being
9
A
linear
B
nonlinear
C
nonlinear for small temperature changes and linear for
large
D
linear for small temperature changes and nonlinear for
large
Created by Boundless
Over temperature changes of 100 ºC or less, resistivity (ρ) varies with temperature
change (ΔT) as:
A
, where ρ0 is the original resistivity and α is the
temperature coefficient of resistivity
B
, where ρ0 is the original resistivity and α is the
temperature coefficient of resistivity
C
, where ρ0 is the original resistivity and α is the
temperature coefficient of resistivity
D
, where ρ0 is the original resistivity and α is the
temperature coefficient of resistivity