Clive W. Humphris

**RESISTOR VALUE TEST: Select Random Value. **

Resistor values can be determined using the Resistor Colour Code. For the 4-band type, the first two bands are numerical values the third is the multiplier or number of noughts.

For example 3.9kOhms = orange(3), white(9), red(2) = 3900ohms or 3.9kOhms. For values below 10ohms the third band is coloured gold which is a multiplier of 0.1. The fourth band indicates tolerance.

Resistor values are also available as 5-band types. You can select a routine to determine the value of both types Resistor Colour Codes in the Toolbox menu along with another selection for Preferred Resistor Values. Resistors are available in a number of ranges, the most common being the E12(10%) and E24(5%) series, the latter having a closer tolerance, therefore more values are required to ensure every likely value is covered.

The Toolbox also contains a routine for finding preferred types. Calculations will often produce odd resistor values and in some cases very close tolerance high stability types may be required. For this purpose the E48(2%), E96(1%) and E192(0.5%) ranges are available, obviously this closer precision is reflected in their cost.

- Table of Contents
- Interactive eTextbooks
- Basic Electronics
- Conductor And Insulator
- Resistor Value Test
- Simple Dc Circuits
- Types Of Switching
- Variable Voltages
- Ohm's Law
- DC Voltage
- DC Current
- Series and Parallel Resistors
- AC Measurement
- AC Voltage and Current
- AC Theory
- RCL Series
- RCL Parallel
- Capacitance
- Capacitors
- Inductance
- Inductors
- Impedance
- Tuned Circuits
- Attenuators
- Passive Filters
- Active Filters
- Oscillators
- Circuit Theorems
- Complex Numbers
- DC Power
- AC Power
- Silicon Controlled Rectifier
- Power Supply
- Voltage Regulation
- Magnetism
- Electrical Machines
- Transformers
- Three Phase Systems
- Energy Transfer and Cost
- Atomic Structures
- Diode Theory
- Diode Applications
- Transistor Theory
- Bipolar Transistors
- Transistor Configurations
- Active Transistor Circuits
- Field Effect Transistors
- Basic Operational Amplifier
- Op-Amp Theory
- Op-Amp Applications
- Sum and Difference Amplifiers
- Analogue Multi-Meter
- Measurement
- Component Testing
- Area
- Surface Area and Symmetry
- Volume
- Compound Measures
- Geometry
- Motion
- Machines
- Optics
- Number Systems
- Number Conversion
- Number Types
- Roots
- Angles and Parallels
- Triangle Ratios
- Triangle Angles
- Percentages
- Ratios
- Fractions
- Vectors
- Circle Angles
- Laws
- Algebra 0
- Algebra 1
- Algebra 2
- Mathematical Rules
- Powers and Indices
- Simplifying
- Linear Equations
- Graphing
- Slope and Translation
- Curves and Angle Conversion