Question

A transformer has 100 turns on the input side and 500 turns on the output side. If rms value of input voltage and current is 220V and 5A respectively. The output power is:
(A) 300 watt
MB) 1100 watt
(C) 1440 watt
(D) 50 watt
(UET 2015)​

Answer 1

Answer:

B) 1100 watt

Explanation:

P= V.I

P= (220)(5)

P= 1100 Watt

Answer 2

Answer:

The output power is: B) 1100 watt

Explanation:

• A transformer is a device used for transferring current from one circuit to another circuit. Two coils are there in a transformer - primary coil and secondary coil.
• Transformer formula: We know that the transformer equations are-

      (1)    $\frac{V_p}{V_s} = \frac{N_p}{N_s}$      and    (2)  $V_p \times I_p = V_s \times I_s$

$V_p$ = input voltage of primary coil, $V_s$ =output voltage of secondary coil.

$N_p$=Number of turns in primary coil,$N_s$ =Number of turns in secondary coil

$I_p$=  input current of primary coil, $I_s$ =output current of secondary coil.

• Solution:  $N_p = 100, N_s = 500, V_p = 220 V$

    Putting values in equation (1),  $\frac{220}{V_s} = \frac{100}{500}$  

                                                   220 × 500 = 100$V_s$

                                                       $V_s$ = 1100 V

      $V_s$ = 1100 V,  $V_p = 220 V, I_p = 5A$,

   Putting values in equation (2), 220 × 5 = 1100 $I_s$

                                                      $I_s$ = 1 A

    Output power = $V_s \times I_s$ = 1100 × 1 = 1100 Watt

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