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long wire with a diameter of 
long wire with a diameter of 
and cross-sectional area 
has a resistance of 
. What is the resistance of a wire of the same metal of length 
and cross-sectional area of 
?
flowing through a resistor and the voltage 
across it. Draw a graph of current against voltage. Does Ohm's law apply in this case? Determine the resistance of the resistor from the graph.
and a resistivity of 
. Calculate the length of the wire needed to make a 
electric fire element.
-long resistance wire with a cross sectional area of 
, has a resistance of 
. Calculate the resistivity of the wire.
, a diameter of 
and a resistance of 
. Calculate the resistance of a wire of the same material of length 
and a diameter of 
.
and resistivity 
required to make a standard resistor of resistance 
.
, has a resistance of 
. Calculate the length of wire required if the resistivity of nichrome is 
.
and cross sectional area 
, if its resistance is 
.
