Question
Download Solution PDFWhich 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)
Answer (Detailed Solution Below)
Option 2 : P = IR
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Detailed Solution
Download Solution PDFThe 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).
Last updated on Jun 16, 2025
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