Purchase Solution

An immersion heater

Not what you're looking for?

Ask Custom Question

An immersion heater used to boil water for a single cup of tea plugs into a 120V outlet and is rated at 300W.

What is the resistance of the heater?

Suppose your super0sive, super-insulated tea mug contains 400g of water at a temp of 18 degrees Celsius. How long will this heater take to bring the water to a boil? Ignore the energy needed to raise the temperature of the mug and the heater itself.

Purchase this Solution

Solution Summary

The power is given by the following expression P= U^2/R.

Solution Preview

The power is given by the following expression P= U^2/R, where U is a voltage and R is a resistance, solving for R you get:

R = U^2/P = 120^2/300 = 48 ...

Purchase this Solution

Free BrainMass Quizzes
Variables in Science Experiments

How well do you understand variables? Test your knowledge of independent (manipulated), dependent (responding), and controlled variables with this 10 question quiz.

The Moon

Test your knowledge of moon phases and movement.

Basic Physics

This quiz will test your knowledge about basic Physics.

Intro to the Physics Waves

Some short-answer questions involving the basic vocabulary of string, sound, and water waves.

Introduction to Nanotechnology/Nanomaterials

This quiz is for any area of science. Test yourself to see what knowledge of nanotechnology you have. This content will also make you familiar with basic concepts of nanotechnology.