Resistance

Question 1

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

Answer 1

A conductor

Question 2

Name some examples of a conductor

Answer 2

Platinum
Impure water
Gold
Aluminium
Copper
Mercury
Carbon
Sliver
Brass

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

Name examples of insulators

Answer 4

Porcelain
Paper
Glass
Plastic
Rubber
Mica
Wood
Insulating varnish
Woven fabrics

Question 5

What different factors affect the resistance of a conductor?

Answer 5

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

Question 6

What does ohms law state ?

Answer 6

That current flowing through a conductor is directly proportional to the applied voltage and inversely proportional to the resistance

Question 7

What is in Ohms law triangle?

Answer 7

Voltage (V = I x R)
Current (I = V / R)
Resistance (R = V / I)

Question 8

What must remain constant, for Ohms Law to be true ?

Answer 8

Temperature

Question 9

What is the unit of resistance?

Answer 9

Ohms

Question 10

State the formula for calculating total resistance in a series circuit

Answer 10

Rt=R1+R2+R3

Question 11

What should show that the answer of total resistance in a parallel circuit is the correct answer?

Answer 11

Rt should have a lower valve than the lowest resistor

Question 12

State the formula for calculating total resistance in a parallel circuit

Answer 12

1/Rt = 1/R1 + 2/R2 + 3/R3