An immersion heater with a power rating of 600 W is used to heat water.How long should it take to bring 1.9 L of water from room temperature (20 $\circ$ C)to 87 $\circ$ C?

Question

Quizplus · Accepted Answer

To calculate the time, use the formula: $ Q = mc\Delta T $ where $ Q $ is the heat energy, $ m $ is the mass of water, $ c $ is the specific heat capacity of water (4.186 J/g°C), and $ \Delta T $ is the temperature change. Convert 1.9 L of water to 1900 g. The temperature change is $ 87°C - 20°C = 67°C $. Calculate $ Q $ and then use $ P = \frac{Q}{t} $ to find time $ t $, where $ P $ is power (600 W). Solving gives approximately 14.8 minutes.

An Immersion Heater with a Power Rating of 600 W ∘\circ∘

An Immersion Heater with a Power Rating of 600 W $\circ$