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Which of the following is not an expression of power?
P=VI
P=I2R
P=RV2тАЛ
P=RIтАЛ
P=RIтАЛ
Electric power in a DC circuit is defined as the rate at which electrical energy is dissipated or converted into other forms, such as heat. The fundamental power formulas are derived from the relationship P=V├ЧI combined with Ohm's Law (V=IR).
Electric power in a DC circuit is defined as the rate at which electrical energy is dissipated or converted into other forms, such as heat. The fundamental power formulas are derived from the relationship P=V├ЧI combined with Ohm's Law (V=IR).
P=VI тАФ Power in terms of Voltage and Current
P=I2R тАФ Power in terms of Current and Resistance
P=RV2тАЛ тАФ Power in terms of Voltage and Resistance
The power dissipated in a resistor is given by the product of voltage across it and current through it. By substituting V=IR into P=VI, we obtain P=(IR)I=I2R. Similarly, substituting I=V/R into P=VI, we obtain P=V(V/R)=V2/R. The expression P=I/R is dimensionally incorrect (Units: A/╬й = Siemens, which is conductance, not Watts).
Power is defined as the work done per unit time, measured in Watts (W).
Ohm's Law (V=IR) is valid for linear, ohmic conductors.
The expression P=I/R is physically meaningless for power, as its unit is Siemens (conductance).
Power is always a positive value for passive resistive components.
Useful for calculating thermal dissipation in components
Essential for sizing fuses and protective devices
Only applicable directly to DC or instantaneous AC power calculation
Designing circuit boards
Electrical power systems
Heating element design
The unit of power is the Watt (W), where 1W=1J/s.
Option D represents G (Conductance), not P (Power).
D is correct тАФ The expression P=I/R is dimensionally inconsistent with the unit of power and does not represent any derivation of electrical power.
Always check the units of an expression if you are unsure; power must result in Watts, which corresponds to V2/╬й or A2╬й.