Key relationship
Resistor Ω or capacitor pF=(10a+b)10^c; diode band marks cathode.
Physics · Practical apparatus
Identify components and marking codes
Inspect the specimen shape and decode its markings. Resistor bands and capacitor digits encode values in different units. A diode stripe identifies a terminal rather than a resistance multiplier.
Open the interactive experiment →Identify components and marking codes
வடிவத்தையும் குறியீட்டையும் பார்த்து கூறை அடையாளம் காணவும். டையோடின் பட்டை கத்தோடைச் சுட்டும்.
Key notes, relationships and model limits
Practical tip
Inspect the specimen shape and decode its markings. Resistor bands and capacitor digits encode values in different units. A diode stripe identifies a terminal rather than a resistance multiplier.
Common trap
A printed value or colour code is not a test of whether the component works.
Model limits
Selected marking conventions; resistor tolerance not varied. Markings identify nominal values and polarity, not actual measured tolerances or component health.
What you will learn
Decode nominal values and diode terminal markings.
Try the experiment
Try both scenarios, change one control, and predict the result before checking the graph and readouts.
Think of it this way
Change one input while keeping the others fixed, as you would in a controlled experiment.
Worked example
104 on a capacitor means10×10⁴ pF=100 nF; yellow-violet-red is4.7 kΩ.
Why this matters
The model connects identify components and marking codes with an observable reading. Check the equation and assumptions before applying it.
Before you start
SI units · algebra · graph reading
Check your understanding
The band on a conventional diode marks?
- Anode
- Cathode
- A capacitance value
Read the explanation
The cathode stripe is a polarity mark.
Course connection: Virtual apparatus preparation. Check exact board/exam membership in the syllabus sources. Physical practical work remains necessary.