30 July 26
Fibre optic cable carries data as light down a glass core, guided by total internal reflection — the same physics demonstrated with a torch and a water stream in every school lab, industrialised into ...Read the full story
30 July 26
An uninterruptible power supply does a more modest job than its name suggests, and understanding that is the key to buying the right one. A typical UPS exists to bridge the gap between the mains faili...Read the full story
29 July 26
Joint quality is decided by three things: the iron, the technique and the consumables — and the third gets the least attention while causing a remarkable share of the problems. The solder alloy sets t...Read the full story
28 July 26
A printed circuit board is a laminate sandwich: a fibreglass substrate (almost always FR-4), copper foil etched into tracks, a solder mask that keeps molten solder where it belongs, and a silkscreen l...Read the full story
28 July 26
The 18650 is the workhorse lithium-ion cell — 18mm across, 65mm long, and behind everything from torches and vapes to power tool packs, e-bikes and portable instruments. The catch is that every 18650 ...Read the full story
27 July 26
A potentiometer is a resistor with a third terminal — a wiper that slides along the resistive track — and that one addition makes it two components in one. Use all three terminals and it's a voltage d...Read the full story
27 July 26
The short answer
Choose a connector by asking why the joint needs to separate at all. Every connector is a deliberately engineered break in a circuit — added to make a product easier to build, ...Read the full story
22 July 26
The three devices in a modern consumer unit or control panel divide the protection job neatly: an MCB protects the circuit against overcurrent, an RCD protects people against earth leakage, and an RCB...Read the full story
22 July 26
The short answer
An instrumentation build needs the sensors themselves, signal conditioning, data acquisition where measurements are recorded, screened field cable, M8/M12 connectors, junctio...Read the full story
17 July 26
Undersized contactors are one of the most common causes of premature failure in motor circuits — and the mistake usually happens at specification, not installation, because the headline current rating...Read the full story
16 July 26
Choose a thermocouple for wide temperature ranges and harsh environments, an RTD for accuracy and long-term stability, and a thermistor for high sensitivity over a narrow range at low cost. That's the...Read the full story
16 July 26
Choosing the right cable or wire doesn’t have to be complicated, but it does mean knowing what actually matters for your specific setup. Rather than looking at everything at once, it’s easier to bre...Read the full story
15 July 26
A metric fastener designation reads diameter × pitch × length: M6 × 1.0 × 20 is a 6 mm nominal diameter thread with a 1.0 mm pitch, 20 mm long. Drop the pitch — M6 × 20 — and the standard coarse pit...Read the full story
15 July 26
The ST L7805CV is the standard three-terminal 5V linear regulator — the TO-220 part that has turned unregulated supplies into clean 5V rails for fifty years. It isn't going anywhere: the 7805 remain...Read the full story
14 July 26
Resistor colour bands encode the value directly: the first bands are digits, the next is a multiplier, and the last is the tolerance. Yellow–violet–red–gold reads as 4, 7, ×100 — 4.7 kΩ at ±5%. Ten co...Read the full story
13 July 26
The short answer
A control panel build needs ten categories of product: enclosure, DIN rail, power supply and distribution, control devices, terminal blocks, internal wiring, cable management, ...Read the full story
13 July 26
Reading a vernier caliper takes two steps: read the whole millimetres from the main scale at the vernier's zero mark, then find the one vernier graduation that lines up exactly with a main-scale line ...Read the full story
10 July 26
Rapid Electronics was proud to support the recent Engineering Student Awards Event at Colchester Institute through the donation of Rapid branded multimeters for award-winning students. Combining p...Read the full story
10 July 26
A circuit symbol is a standardised shorthand for a component. In the UK, schools, exam boards and industry all use the same standard — BS EN 60617, the British version of the international...Read the full story
09 July 26
The K-type is the general-purpose workhorse of temperature measurement: a chromel–alumel thermocouple covering roughly −200°C to +1260°C, cheap to make, tough enough for industrial use and supported...Read the full story
09 July 26
The short answer
A terminal block is chosen on five parameters: pitch, current and voltage rating, conductor cross-section, pole count, and connection method. Pitch is the unforgiving one — i...Read the full story
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