Factors Affecting Resistance

In this post, i wanna discus the next section 2.2 learning outcome which is:

1. Factors that affect resistance. What are the factors???

i. Length(l) of conductor :
R is directly proportional with l. The longer the length the bigger the resistance.

Just imagine if you need to choose between1000m & 5000m marathon, which one will cause bigger resistance to you?

ii. Area(crossectional area,A) of conductor:
R is inversely proportional with A i.e the bigger the area the smaller the resistance

iii. Temperature(T):
R is directly proportional with T
The higher the temperature, the bigger the resistance.

iv. Type of conductor
Resistance depends on type of conductor used, different metals have differen resistive value.
Silver has less resistance than copper..but usually copper is widely used in a lab coz its cheaper.

Please check out the experiment involved on factors affecting resistance in yr text/reference book.

2.The next outcome, u must be able to-
Describe superconductors:
Superconductors are materials that have almost ZERO resistance as the temperature
decrease towards absolute zero (-273 degree celcius).

Superconductors can carry current without loss of energy..thus the transfer of energy is very efficient.

Its application is widely used in levitated train (bullet train).