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CBSE Class 10 Science 2015 Term I Set 1

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Question : 16
Total: 36
Find the current drawn from the battery by the network of four resistors shown in the figure.
Solution:  
Resultant resistance of R1,R2 and R3 :
R′‌=R1+R2+R3
‌=10+10+10=30Ω
Resultant resistance of the circuit :
‌
1
R
‌=‌
1
R′
+‌
1
R4

‌=‌
1
30
+‌
1
10
=‌
1+3
30
=‌
4
30

R‌=‌
30
4
=‌
15
2
=7.5
Here, V=3V,I= ?
By Ohm's law,
⇒V‌=IR
‌I‌=‌
V
R
=‌
3
7.5
=‌
30
75
=0.4A
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