Electrical - Resistance

Question 1

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

Answer 1

Conductor

Question 2

Give 4 examples of a conductor:

Answer 2

Aluminium
Salt water
Gold
Silver
Platinum,
Carbon
Copper

Question 3

A material with few free electrons will only pass current with difficulty is called an…?

Answer 3

Insulator

Question 4

Give 4 examples of an insulator?

Answer 4

Glass, mica, rubber, wood

Question 5

List 4 different factors which affect the resistance of a conductor:

Answer 5

1. Cross sectional area
2. length of conductor
3. temperature
4. type of material

Question 6

State Ohm’s Law.

Answer 6

Ohm’s law states that a current flowing through a conductor is directly proportional to the voltage applied across it, providing the temperature remains constant, and is inversely proportional to the resistance.

Question 7

State the formula for calculating resistance in a series circuit.

Answer 7

Rt = R1 + R2 + R3…

Question 8

Sate the formula for calculating resistance in a parallel circuit.

Answer 8

1/Rt = 1/R1 + 1/R2…

Question 9

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

Answer 9

The sum of all resistances is equal to the total resistance.