10. Compare the power used in the 2 2 resistor in each of the
following circuits:
(i) a 6 volt battery in series with 19 and 2 12 resistors and,
(ü) a 4 V battery in parallel with 1292 and 22 resistors.
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Answer:
(i) Potential difference (V) = 6 V
Here 1 Ω and 2 Ω resistors are connected in series.
∴ equivalent resistance of the circuit (R) = 1 + 2 = 3 Ω
According to Ohm’s law
V = IR
Or I=V/R=6/3=2A
the current through the circuit (I)=2A
Now the power used in the 2 Ω resistor
we know that Power = I2R
= 2×2×2=8W
(ii) Potential difference, V = 4 V
12 Ω and 2 Ω resistors are connected in parallel. The voltage across each component of a parallel circuit remains the same. Hence, the voltage across 2 Ω resistor will be 4 V. Power consumed by 2 Ω resistor is given by
∴ the power used by 2 Ω resistor is 8 W.
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the power used by 2 a resistor is 8 volt
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