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Electricity — Science STD 10 — Question

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

Answer

a. $R_1=500$ ohm, $R_2=1000$ ohm
As per given figure,
$R=R_1+R_2=500+1000=1500 \text { ohm. }$
b. $R_1=2 ohm , R_2=2 ohm$
As per given figure,
$\frac{1}{R}=\frac{1}{R_1}+\frac{1}{R_2}$
$\frac{1}{R}=\frac{1}{2}+\frac{1}{2}$
$R=1$ ohm
c. $R_1=4$ ohm, $R_2=4$ ohm, $R_3$
As per given figure,
$\frac{1}{R}=\frac{1}{R_1}+\frac{1}{R_2}$
$\frac{1}{R}=\frac{1}{4}+\frac{1}{4}$
$R=2$ ohm
Total resistance $=R+R_3$
$= 2 + 3 = 5$ ohm

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