Resistors 030104d

Question 1

What are the three types of fixed resistors?

Objective 1 Page 2

Answer 1

Composition

Film

Wire-Wound.

Question 2

What are the two types of variable resistors?

Objective 1 Page 5 & 6

Answer 2

Rheostats

Potentiometers

Question 3

What are the three distinct ratings related to resistors?

Answer 3

Resistance rating (Ω)

Power rating (W)

Tolerance rating. (%)

Question 4

How many terminals are on Rheostats and potentiometers?

Objective 1 Page 5 & 6

Answer 4

Rheostats have 2 terminals

Potentiometers have 3 terminals

Question 5

What is the two ways to determine the resistance value of a resistor?

Objective 2 Page 8 / Objective 3 Page 13

Answer 5

Printed directly on the resistor using a resistor code.

Colour bands around the resistor.

Example. 2R2 = 2.2 Ω 2K2 = 2200 Ω Letter represents a decimal and unit.

Colour bands are used when the resistor is physically too small to be labelled.

Question 6

What types of resistors are usually for lower power ratings and are too small to be labelled?

Objective 2 Page 10

Answer 6

Composition

Film

Power rating is indicated by their physical size.

Question 7

What type of resistor is often used for high power ratings?

Objective 2 Page 10

Answer 7

Wire-Wound

Physically larger than Composition and Film resistors. Power rating labelled directly on the resistor.

Question 8

What does the tolerance rating represent on a resistor?

Objective 2 Page 11

Answer 8

The degree of accuracy of the labelled resistance.

Rating is given as a percentage.
Example. 5.1 Ω resistor with a 10% tolerance will have a resistance of 4.59 Ω to 5.61 Ω

Question 9

What does each of the band represent on a resistor?

Colour Band Code

Objective 3 Page 13

Answer 9

Band 1 - 1st digit of the resistance value.

Band 2 - 2nd digit of the resistance value.

Band 3 - Resistance Multiplier.

Band 4 - Tolerance Rating. (%)

Read from left to right.