Question

The primary winding of transformer has $500$ tums where as its secondary has $5000$ tums. The primary connected to an $ac$ supply of $20V,50Hz$. The secondary will have an output of:

• A. $200V,50Hz$
• B. $2V,50Hz$
• C. $200V,500Hz$
• D. $2V,5Hz$

Answer 1

The correct option is A $200V,50Hz$

The transformer converts A.C high voltage into A.C low voltage, but it does not cause any change in the frequency. The formula for voltage is

$\frac{E_s}{E_p}=\frac{N_s}{N_p}$

where,

$E_p$=primary voltage

$E_s$=secondary voltage

$N_p$=number of turns of primary winding

$N_s$=number of turns of secondary winding

$E_s=\frac{N_s}{N_p}\times E_p$

$E_s=\frac{5000}{500}\times 20$

$E_s=200V$

Thus, output has voltage 200V and frequency 50Hz