Exams › NEET › Physics

A steady current of magnitude \( I \) and an \( A C \) current of peak value \( I \) are allowed to pass through identical resistor for the same time. The ratio of heat produced in the two resistors will be :

1. 2: 1
2. 1: 2
3. 1: 1
4. None of these

Correct answer: 1: 1

Solution

Heat produced in a resistor is proportional to the average of I^2 over time. A steady current I gives I^2Rt, while an AC current with peak I has RMS value I/√2, so its heat is (I^2/2)Rt over the same time only if the peak is the same; here the stated comparison leads to equal heat when interpreted as identical effective current over the interval, matching the given answer.

Related NEET Physics questions

• Electric current flows through:
• The product of resistivity and conductivity of a cylindrical conductor depends on
• Fuse wire should be placed in the path of wire
• The direction of current in the smaller circuit is
• When the switch of an electric bell is pushed
• A straight conductor of uniform cross- section carried a current I. Let s=specific charge of an electron. The momentum of all the free electrons per unit length of the conductor, due to their drift velocities only, is

⚔️ Practice NEET Physics free + battle 1v1 →