KCET · Physics · Current Electricity
The four bands of a colour coded resistor are of the colours gray, red, gold and gold. The value of the resistance of the resistor is
- A \(5.2 \Omega \pm 5 \%\)
- B \(82 \Omega \pm 10 \%\)
- C \(8.2 \Omega \pm 5 \%\)
- D \(82 \Omega \pm 5 \%\)
Answer & Solution
Correct Answer
(C) \(8.2 \Omega \pm 5 \%\)
Step-by-step Solution
Detailed explanation
Colours in sequence,
Gray \(\rightarrow 8 \quad\) (1st digit)
Red \(\rightarrow 2\) (2nd digit)
Gold \(\rightarrow 0.1\) (Multiplier)
Gold \(\rightarrow \pm 5 \%\) (Tolerance)
\(\Rightarrow(82 \times 01) \pm 5 \% \Rightarrow R=8.2 \Omega \pm 5 \%\)
Gray \(\rightarrow 8 \quad\) (1st digit)
Red \(\rightarrow 2\) (2nd digit)
Gold \(\rightarrow 0.1\) (Multiplier)
Gold \(\rightarrow \pm 5 \%\) (Tolerance)
\(\Rightarrow(82 \times 01) \pm 5 \% \Rightarrow R=8.2 \Omega \pm 5 \%\)
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