Resistance

Question 1

A material with many free electrons will pass current freely is called a ?

Answer 1

Conductor

Question 2

What are examples of conductors

Answer 2

Copper
Brass
Silver
Carbon
Impure water (salt water)
Aluminium
Platinum
Mercury
Gold

Question 3

What is a material with few free electrons,and will only pass current with diffuculty

Answer 3

An insulator

Question 4

What are examples of insulators

Answer 4

Glass
Wood 
Paper
Rubber
Mica
Insulating varnish 
Porceleain
Plastic
Woven fabrics

Question 5

What are the diffrent factors inwhich affects the resistance of a conductor

Answer 5

Length of conductor
Type of material
Temperature

Question 6

Ohm’s law states that a_____flowing through a conductor…

Answer 6

Current

Question 7

…is directly proportional to the applied _______ across it

Answer 7

Voltage

Question 8

…providing the_____ remains constant

Answer 8

Temperature

Question 9

And is _____ proportinal to the resistance.

Answer 9

Inversley

Question 10

What is the unit of resistance

Answer 10

Ohms

Question 11

State the formula for calculating toral resistance in a parellel circuit

Answer 11

1/Rt = 1/R1 + 1/R2 + 1/R3

Question 12

After working out total resistance (Rt) in a parallel circuit , what is a good check that your answer is correct

Answer 12

Rt should have a lower value than the lowest resistor