Tools & Accessories
Resistor 1kΩ
৳2
1kΩ quarter-watt carbon film resistor — the standard value for driving a transistor base and for light-duty pull-ups.
One of the three or four values worth always having in a drawer, since it appears in almost every transistor switching circuit.
Where it is used
- Base resistor when a microcontroller pin switches a transistor
- Voltage dividers and signal attenuation
- Very dim LED indicators where visibility barely matters
Not sure it will work? Test your circuit free in Tekko Sim — on your phone, in Bangla or English.
| Category | Tools & Accessories |
| Model no. | 1K 1/4W |
| Availability | In stock |
| In stock | 100 pcs |
| Delivery | Cash on Delivery, nationwide Bangladesh |
| Resistance | 1kΩ, 1000Ω |
| Power Rating | 0.25W, quarter watt |
| Tolerance | ±5% typical for carbon film |
| Type | carbon film, axial through-hole |
| Colour Code | brown, black, red, gold |
Questions about the Resistor 1kΩ
Why does a transistor need a base resistor?
Without one, the base-emitter junction looks like a forward-biased diode across the pin and draws whatever current the microcontroller can supply, which damages both. 1kΩ from a 5V pin gives roughly 4 mA into the base, enough to saturate a small signal transistor such as a 2N2222 or BC547.
Can I use 1kΩ with an LED?
It will light, but faintly — around 3 mA on a 5V rail. Fine as a subtle indicator inside an enclosure, too dim for anything you need to see across a room.
What do the colour bands mean?
Brown, black, red, gold — digits 1 and 0, multiplied by one hundred, at 5% tolerance.
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