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Electricity — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceElectricity5 Marks
Question
Calculate the combined resistance in each case:
✓

Answer

  1. R1 = 500 ohm, R2 = 1000 ohm

As per given figure,

R = R1 + R2 = 500 + 1000 = 1500 ohm.

  1. R1 = 2 ohm, R2 = 2 ohm

As per given figure,

$\frac{1}{\text{R}}=\frac{1}{\text{R}_1}+\frac{1}{\text{R}_2}$

$\frac{1}{\text{R}}=\frac{1}{2}+\frac{1}{2}$

R = 1 ohm

  1. R1 = 4 ohm, R2 = 4 ohm, R3

As per given figure,

$\frac{1}{\text{R}}=\frac{1}{\text{R}_1}+\frac{1}{\text{R}_2}$

$\frac{1}{\text{R}}=\frac{1}{4}+\frac{1}{4}$

R = 2 ohm

Total resistance = R + R3

= 2 + 3 = 5 ohm

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