Which of the following terms does not represent electrical power in a circuit?
- I2R
- IR2
- VI
- \(\frac {V^2}{R}\)
The Correct Option is B
Solution and Explanation
We know that electric power is given by \(P = VI\) … (i)
So, the option (C) is correct.
According to Ohm’s law, \(V = IR\) … (ii)
Now putting the value of \(V\) from (ii) in (i), we get
Power \(P = (IR) × I = I^2R\)
So, the option (A) is correct.
Now putting the value of \(I\) from (ii) in (i), we get
Power \(P = V(\frac VR) =\frac { V^2}{R}\)
So, the option (D) is correct.
Hence, the option (B) does not represent electrical power in a circuit.
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Concepts Used:
Electric Power
Power is defined as the rate of doing work. Electric power is the rate at which electrical energy is transferred through an electric circuit, i.e. the rate of transfer of electricity. The symbol for Electric Power is ‘P’. SI unit of electric power is Watt.
Electric Power Formula
P = VI
From Ohm's Law, V = IR
Hence, Power can also be expressed as P = I2R