Question

L. LOVVII U3 LUUL
11. The turns ratio in a step-up transformer is 1 : 4. On passing a current of 4A in the primary,
the current in the secondary will be:
a. 0.25A
b. 1A
c. 2A
d. 8A​

Answer 1

Answer:

b.1A the turns radio in a set up transformer

Answer 2

Current in secondary coil will be 1 A

Explanation:

• Transformer is a device used to change the voltage on load end as per our requirements like reduce or increase the voltage with respect to input signal
• Step-up transformer is used to increase the voltage on output end, by increasing the voltage current decreases as to maintain the power same
• Number of turns of primary and secondary depends by following relation

                                $\frac{T_{1} }{T_{2} } =\frac{V_{1} }{V_{2} } =\frac{I_{2} }{I_{1} }$

where, T₁ = number of turns of primary coil

T₂ = number of turns of secondary coil

V₁ = voltage of primary coil

V₂ = voltage of secondary coil

I₁ = current on primary coil

I₂ = current on secondary coil

Given,

$\frac{T_{1} }{T_{2} } =\frac{1}{4}$

I₁ = 4 A

=> $\frac{T_{1} }{T_{2} } =\frac{I_{2} }{I_{1} }$

=> I₂ = 4/4

=> I₂ = 1 A

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