class 10 question -36. (a) Two lamps, one is rated 100 W at 220 V, and the other 60 W at 220
V, are connected in parallel to a 220 V supply. Find the current drawn
from the supply line.
(b) Derive an expression when three resistors R1 , R2 and R3 are
connected in parallel in an electric circuit.
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☞ Current in the circuit
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✭ Qn 1- Two lamps are rated 100 W & 60 W with a pd of 220 V
✭ Qn 2 - There are three resistors connected in parallel
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◈ Qn 1 - Current in the circuit?
◈ Qn 2 - Derivation of the formula to find net resistance?
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Question 1
We shall find the current through the circuit with the help of,
- P = 100+60 = 160 W
- V = 220
- I = ?
Substituting the given values,
➝
➝
➝
➝
Question 2
Given that there are 3 Resistors - R¹,R² & R³ then,
◕ V = constant
◕
As per Ohm's law,
It can also be written as,
➳
⪼
⪼
⪼
Substituting the values in eq(1)
➳
➳
➳
➳
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