In pure resistor circuit, power is calculated by

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P=VI

Explanation: In a pure resistor circuit, the power (P) is calculated using the formula P = VI, where V is the voltage across the resistor and I is the current flowing through it. This is fundamental to understanding how electrical energy is converted to heat in the resistor. Working Principle: The power in a resistor is determined by the product of voltage and current, which represents the rate at which electrical energy is converted into heat due to the resistance. As current flows through the resistor, the electrical energy is dissipated as thermal energy resulting in a rise in temperature of the resistor. Key Formulas: $P = VI$ — Power calculated in terms of voltage and current; $P = I^2 R$ — Alternative formula using current and resistance Key Points: The relationship of power to voltage and current is critical in circuit analysis.; Power dissipation in a resistor is proportional to the square of the current. Advantages: Simple to compute using basic electrical parameters.; Easily applicable in various circuit calculations. Disadvantages: Does not account for reactance in AC circuits.; May not apply when non-linear components are involved. Applications: Used in designing electrical circuits where resistors are prominent.; Essential for calculating energy consumption in electrical devices. Additional Info: Standard Values: Standard units for measuring power are watts (W), voltage in volts (V), and current in amperes (A).. Wrong Options Explained: Option A: P = V/I is incorrect as it defines resistance; Option B: P = I/V is dimensionally incorrect; Option C: P = IR gives power in another form but needs current to be known. Answer: D is correct — Power is calculated by the product of voltage and current in a resistor circuit. Exam Tip: Always remember that power calculations can vary based on the component type in the circuit, especially when reactive components are involved.

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