Question

In a step-up transformer, the turn ratio is 1 : 2. A Leclanche cell (e.m.f. 1.5V) is connected across the primary. The voltage developed in the secondary would be
 A. \[0\;{\rm{V}}\]
B. \[3.4\;{\rm{V}}\]
C. \[4\;{\rm{V}}\]
D. \[2\;{\rm{V}}\]

Answer 1

Hint: The given problem can be resolved using the concept that the voltage will produce only when the transformer or the coil worked device will undergo the supply of the alternating current (AC). The alternating current is the varying phase current that possesses applications in several electrical and circuit analysis. Moreover, the Leclanche cell only works on the direct current. Therefore, the appropriate relationship between the direct current and the voltage development needs to be considered.

Complete step by step answer:
The given problem involves the Leclanche cell, which utilizes the direct current for its functioning and the Leclanche cell provides the direct current (DC) in the form of electrical output. Therefore, there is no significance in the turn ratio. In this case, the turn ratio is employed for the alternating current devices, not the direct current. Thus, the turn ratio makes no sense for the Leclanche cell, and hence the voltage at the secondary will be of zero volts.

So, the correct answer is “Option A”.

Note:
 To resolve the given problem, the working of the transformer and the development of voltage in the secondary and primary coils need to be understood. The appropriate relation is useful in determining the magnitude of the voltage and current flowing through the transformer's coils. Moreover, the relation for the alternating current and the direct current, along with their significance is also need to taken into analysis