MCQ
Two resistors whose value are in ratio $2: 1$ are connected in parallel with one cell. Then ratio of power dissipated is
- A$2: 1$
- B$4: 1$
- ✓$1: 2$
- D$1: 1$
✓
Answer
Correct option: C.
$1: 2$
It is given $R_{\text {Hot }}=10 R_{\text {Cold }}$ also resistance at rated temperature $R=\frac{V^2}{P}=\frac{200 \times 200}{100}=400 \Omega$.
So resistance when lamp not in use.$R_{\text {Cold }}=\frac{R_{\text {Hot }}}{10}=\frac{400}{10}=40 \Omega$
So resistance when lamp not in use.$R_{\text {Cold }}=\frac{R_{\text {Hot }}}{10}=\frac{400}{10}=40 \Omega$
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