I like your profile picture:)
c tell your parents it could be someone very dangerous and meeting people online can be very risky I would also tell my bsf just for fun tho
B . it should be convert energy.
Answer:
Output voltage is 1.92 volts.
Explanation:
Given that,
Number of turns in primary coil, 
Number of turns in secondary coil, 
Input voltage, 
We need to find the voltage output of a transformer used for rechargeable flashlight batteries. For a transformer, the number of turns and the voltage ratio is given by :

So, the output voltage is 1.92 volts.