Resistance

Question 1

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

Answer 1

Conductor

Question 2

List Examples of conductors

Answer 2

Silver
Carbon
Mercury
Brass
Aluminium 
Impure water
Copper
Gold
Platinum

Question 3

What is a material with few free electrons and will only pass current with difficulty is called?

Answer 3

An insulator

Question 4

List Examples of an insulator

Answer 4

Wood
Glass
Rubber
Mica
Woven fabrics
Paper
Plastic 
Insulating varnish
Porcelain

Question 5

What are the different factors which will affect the resistance of a conductor?

Answer 5

Type of material
Length of conductor
Cross sectional area of conductor
Temperature

Question 6

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

Answer 6

Rt should have a lower value than the lowest resistor.

Question 7

(Ohm’s law)

Ohms law states that a _____ flowing through a conductor,

Answer 7

Current

Question 8

(Ohm’s law)

Is directly proportional to the applied ____ across it,

Answer 8

Voltage

Question 9

(Ohm’s law)

Providing the ____ remains constant

Answer 9

Temperature

Question 10

(Ohm’s law)

And is _____ proportional to the resistance.

Answer 10

Inversely

Question 11

What is the unit of resistance?

Answer 11

Ohm’s (omega sign)

Question 12

State the formula for calculating total resistance in a series circuit.

Answer 12

Rt= R1 + R2 + R3

Question 13

State the formula for calculating total resistance in a parallel circuit.

Answer 13

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