SSC
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The power dissipated in a resistor of resistance R carrying a current I is equal to I2R . The value of I has an uncertainty of ±2% and the value of R has an uncertainty of ±5%. The value of the uncertainty in the calculated power dissipation is
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0.8%
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7%
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9%
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20%
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Explanation:
Detailed explanation-1: -The condition for maximum power dissipation across the load is RL=RTh. If the value of load resistance is equal to the value of source resistance i.e., Thevenin’s resistance, the power dissipated across the load will be of maximum value.
Detailed explanation-2: -To find out, we need to be able to calculate the amount of power that the resistor will dissipate. If a current I flows through through a given element in your circuit, losing voltage V in the process, then the power dissipated by that circuit element is the product of that current and voltage: P = I × V.
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