Which of the following expressions is NOT correct for electric power?
P = I² / R
The correct answer is P = I² / R. Let's analyze each expression for electric power:
- P = VI: This is the fundamental equation for power, where P is power (Watts), V is voltage (Volts), and I is current (Amperes). This is correct.
- P = V²/R: This expression is derived from Ohm's law (V = IR) and the fundamental power equation (P = VI). Substituting I = V/R into P = VI gives P = V²/R. This is correct.
- P = I²R: This expression is also derived from Ohm's law and the fundamental power equation. Substituting V = IR into P = VI gives P = I²R. This is the correct expression for power dissipation in a resistor. Therefore, P = I²/R is incorrect.
- P = I²/R: This expression is incorrect. The correct expression for power dissipated in a resistor is P = I²R. This option represents the inverse of the correct relationship.
In summary, the expression P = I²/R is incorrect. The correct expression for power dissipated across a resistor is \(P = I^2 R\).
Similar Questions
Which of the following household items does NOT use the heating effect of current?
The magnetic field produced by a current-carrying wire at a given point depends on which of the following factors?
If the resistance of a conductor is increased to three times, then the current will be: (voltage V remains constant)
Which of the following statements is/are correct?
Statements:
I) A current carrying conductor acts like a magnet.
II) Moving electrons perpendicular to the magnetic field do not experience any force.
Which physical quantity represents the rate at which electric energy is dissipated or consumed in an electric circuit?
In Fleming's left hand rule, which physical quantity is represented by the middle finger?
The equivalent resistance of the series combination of R ohm and 5 ohm is 7 ohm. Here, R is _______.
The work done in moving a charge +Q across two points having a potential difference K is:
Which of the folloewing devices does NOT make use of current carrying conductor in a magnetic field ?
Which of the following is NOT a valid representation of electrical power P in a circuit? (The current, potential difference and resistance are written symbolically as I, V and R, respectively.)
Important Questions from Electricity
'Net metering' is sometimes seen in the news in the context of promoting the
- The complete form of 'IC' in electronics is
Which of the following household items does NOT use the heating effect of current?
The magnetic field produced by a current-carrying wire at a given point depends on which of the following factors?
If the resistance of a conductor is increased to three times, then the current will be: (voltage V remains constant)
