Question

The following apparatus is available in a laboratory.
Cell : Adjustable from 0 to 1.5 volt
Resistor :             4 W and 12 W
Ammeters :         A₁ of range 0 to 3 A; Least count 0.1 A
                            A₂ of range 0 to 1 A ; Least count 0.05 A
Voltmeters :        V₁ of range 0 to 10 V; Least count 0.5 V
                          V₂ of range 0 to 5 V; Least count 0.1 V
Find the best combination of ammeter and voltmeter for finding the equivalent resistance of the resistors.

Answer 1

The overall range of the voltage is from 0 to 1.5 V and that of current is from 0 to 1.5/3A = 0.5 A. We, therefore, prefer instruments that cover these ranges and also have a better least count.