Question

When a constant current is applied for a time of t seconds, how can you increase the heat produced to four times? A. By increasing resistance to four times B. By decreasing resistance to one fourth C. By increasing the potential difference to four times D. By decreasing the potential difference to one fourth​

Answer 1

Explanation:

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Answer 2

Answer:

According to Joule's law of heating, the heat produced in a resistor is directly proportional to the square of the current for a given resistance, directly proportional to the resistance for a given current and directly proportional to the time for which the current flows through the resistor. H = I2Rt

When a constant current 'I' is applied for a time of 't' seconds, the heat produced can be increased to four times by increasing the resistance to four times the original value. H1 = I2Rt ; H2 = I2(4R)t ; H2 = 4H1