Chapter 23, Problem 79A

To determine

To show: The manner in which these components should be connected to heat the water as rapidly as possible.

Explanation of Solution

Introduction:

The heat produced by the resistor in the heating element in a unit time is equal to the square of the voltage applied to it divisible by its resistance. So, more is the voltage applied to the heating element, more will be the heating.

This can be achieved by connecting the heating element in parallel to the battery. Also, the heating produced varies inversely with the resistance, so lesser is the resistance, more will be the heating.

Therefore, the circuit looks as follows:

  

The ammeter is always connected in series and the voltmeter is connected in parallel.