Resistance and resistivity

Question 1

I - V characteristics

Answer 1

a graph of current against voltage for a particular component of an electrical circuit

Question 2

ohm’s law

Answer 2

a conductor obeys ohm’s law if the current in it is directly proportional to the potential difference across its ends

Question 3

ohmic

Answer 3

a component that obeys Ohm’s law

Question 4

non- ohmic

Answer 4

a component that does not obey ohm’s law

Question 5

NTC - thermistor

Answer 5

a device whose resistance decreases rapidly when the temperature increases

Question 6

threshold voltage

Answer 6

the minimum forward potential difference across a diode at which it starts to conduct

Question 7

light dependent resistor

Answer 7

a component whose resistance decreased when the light intensity increases

Question 8

delocalised electron

Answer 8

an electron that is not attached to a specific ion. but is free to move through out the crystal lattice

Question 9

resistivity

Answer 9

a property of a material; it is a measure of its electrical resistance, defined by ϼ = RA/L