A current I flows through a potential difference V in an electrical circuit containing a resistance R. The product of V and I, i.e., VI may be understood as

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Q: 89 (NDA-I/2013)
A current I flows through a potential difference V in an electrical circuit containing a resistance R. The product of V and I, i.e., VI may be understood as

question_subject: 

Science

question_exam: 

NDA-I

stats: 

0,13,33,15,12,13,6

keywords: 

{'electrical circuit': [0, 0, 0, 2], 'resistance': [0, 0, 1, 2], 'circuit': [0, 0, 1, 3], 'current': [0, 0, 0, 3], 'thermal power': [2, 0, 0, 3], 'vi': [0, 0, 5, 2], 'heat': [10, 3, 13, 46], 'product': [3, 1, 4, 10]}

The product of V and I, VI, in an electrical circuit can be understood as the thermal power radiated by the circuit. When current flows through a resistance in a circuit, it causes the electrons to collide with the atoms in the material, generating heat. This heat is represented by the product of the potential difference V and the current I.

Option 1: Resistance R is not the correct answer as it does not represent the product of V and I. Resistance represents the opposition to the flow of electric current in a circuit.

Option 2: Heat generated by the circuit is the correct answer. As explained earlier, when current flows through a resistance, it generates heat due to the collisions between electrons and atoms.

Option 3: Thermal power radiated by the circuit is the correct answer. The heat generated in the circuit can be radiated into the surrounding environment and is represented by the product of V and I.

Option 4: Rate of change of resistance is not relevant to the product of V and I. The resistance of a circuit does not change with respect to the potential difference or current flowing through it.

In conclusion, the correct answer is option 3, which states that the product of V and I represents the thermal power radiated by the circuit.