R0070 100kΩ 0.25W 5% Carbon Film Resistor – Pack of 1000

This 100kΩ 0.25W Carbon Film Resistor is a reliable general-purpose through-hole resistor suitable for a wide range of low-power electronic circuits. With a resistance of 100,000Ω, ±5% tolerance, and ¼ watt power rating, it is commonly used for transistor biasing, voltage dividers, pull-up and pull-down circuits, sensor circuits, timing networks, and general signal applications. Supplied in a bulk pack of 1000 pieces, these resistors are ideal for electronic kit production, school electronics departments, PCB assembly, prototyping, repairs, and larger production runs.

Key Features

• 100kΩ (100,000Ω) resistance
• 0.25W (¼ watt) power rating
• ±5% tolerance
• Carbon film construction
• Axial through-hole leads
• Suitable for low-power electronic circuits
• Ideal for breadboards and PCB assembly
• Bulk pack of 1000 resistors

What’s Included

• 1000 × 100kΩ 0.25W 5% Carbon Film Resistors

Understanding the Resistor Value

This resistor value can be written in several equivalent ways:
• 100kΩ
• 100K
• 100,000Ω
The letter K represents kilo-ohms, where one kilo-ohm equals 1,000 ohms. Therefore, 100kΩ equals 100 × 1,000, or 100,000Ω.

Resistor Colour Code

For a standard 4-band 100kΩ ±5% resistor, the colour bands are:
Brown – Black – Yellow – Gold
• Brown = 1
• Black = 0
• Yellow multiplier = ×10,000
• Gold = ±5% tolerance
This gives 10 × 10,000 = 100,000Ω (100kΩ).

Common Applications

• Transistor biasing circuits
• Voltage divider networks
• Pull-up and pull-down resistors
• LDR and other sensor circuits
• RC timing networks
• Oscillator circuits
• Audio and signal circuits
• Microcontroller interfaces
• General electronic circuit construction

Classroom Use / Learning Outcomes

Students can use the 100kΩ resistor to:
• Identify resistor values using colour bands
• Understand resistance and tolerance
• Convert between ohms and kilo-ohms
• Construct voltage divider circuits
• Combine resistors with LDRs and other sensors
• Investigate resistor-capacitor timing circuits
• Measure resistance using a multimeter
• Practice breadboard construction and PCB soldering

Teacher Benefits

• Common resistor value for electronics experiments
• Particularly useful for sensor and timing circuits
• Excellent for resistor colour-code activities
• Suitable for breadboard and soldering projects
• Bulk quantity ideal for classrooms and electronic kit production

Perfect For

• Electronic kit production
• Sensor and LDR circuits
• Timing circuits
• PCB assembly
• Breadboard experiments
• Microcontroller projects
• Repairs and prototyping
• Classroom electronics
• Bulk component supplies