An Immersion Heater of Negligible Mass Draws a Current of 7.5

question 108

Multiple Choice

An immersion heater of negligible mass draws a current of 7.5 A from a source with a potential difference of 120 V. The heater is in 0.950 m³ of water. The initial temperature of the water is 12.5ºC. How much time does it take to increase the temperature of the water to 27.5ºC? Neglect any heat loss. One calorie is equivalent to 4.18 J.

• A) 4.7 × 10⁴ s
• B) 3.3 × 10⁴ s
• C) 1.1 × 10⁴ s
• D) 1.6 × 10⁴ s
• E) None of these is correct.

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