Which of the following is NOT the correct relation between electric power (P), electric current(I), electric potential difference (V) and resistance(R): 

This question was previously asked in
RRB Technician Grade III Official Paper (Held On: 29 Dec, 2024 Shift 2)
View all RRB Technician Papers >
  1. P = I2R
  2. P = IR
  3. \(\rm P = \frac{V^2}{R}\)
  4. P = VI

Answer (Detailed Solution Below)

Option 2 : P = IR
Free
RRB Technician Grade 3 Full Mock Test
2.6 Lakh Users
100 Questions 100 Marks 90 Mins

Detailed Solution

Download Solution PDF

The correct answer is Option 2: P = IR.

Key Points

  • Electric Power (P) is the rate at which electrical energy is consumed or generated.
  • P = I2R is derived from Ohm's Law (V = IR) and the definition of power (P = IV).
  • P = (V2/R) comes from the substitution of V = IR into the definition of power.
  • P = VI is the direct formula for power, where V is the potential difference and I is the current.
  • The formula P = IR is incorrect because it does not align with the proper relationships between power, voltage, current, and resistance.

Additional Information

  • Ohm's Law:
    • States that the current through a conductor between two points is directly proportional to the voltage across the two points.
    • Expressed as V = IR, where V is voltage, I is current, and R is resistance.
  • Electric Power:
    • Power (P) in an electrical circuit is the rate at which energy is used or produced.
    • It is measured in watts (W).
  • Resistance (R):
    • The opposition to the flow of electric current in a conductor.
    • Measured in ohms (Ω).
  • Current (I):
    • The flow of electric charge through a conductor.
    • Measured in amperes (A).
  • Voltage (V):
    • The electric potential difference between two points in a circuit.
    • Measured in volts (V).
Latest RRB Technician Updates

Last updated on Jun 16, 2025

-> The RRB Technician 2025 Vacancies have been announced in the Employment Newspaper.

-> As per the Notice, around 6180 Vacancies will be announced for the Technician 2025 Recruitment. 

-> The Online Application form for RRB Technician will be open from 28th June 2025 to 28th July 2025. 

-> The Pay scale for RRB Technician posts ranges from Rs. 19900 - 29200.

-> Prepare for the exam with RRB Technician Previous Year Papers.

Get Free Access Now
Hot Links: teen patti real cash teen patti online teen patti master gold apk teen patti 3a