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The heat produced per unit time, on passing electric current through a conductor at a given temperature, is directly proportional to the ______.

Asked in GUJCET 2019 · Heating and power in resistors

• (1) Electric current
• (2) Reciprocal of electric current
• (3) Square of electric current
• (4) Reciprocal of square of electric current

Step-by-step solution

Why the other options are wrong

• (1) Would make doubling the current double the heating. Joule's law has the current squared, so doubling it gives four times the heat.
• (2) More current through the same conductor always produces more heat, not less.
• (4) Is Joule's law turned upside down; the heating rate rises as I².

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