transformer Q (1 Viewer)

[lacklustre]

"A battery charger is used to recharge 1.5V batteries through a 12V transformer. The transformer has 2400 turns in the primary coil. Assuming 100% efficiency, calculate:

a) no. of turns in secondary coil (done, I got: 300)

b) the output current if the input current is 10mA "

Not sure with part b. I used I_s/I_p = n_p/n_s and got 1.25mA. The answer says 80mA.

Can anyone verify this?

 

[Forbidden.]

I_S = I_Pn_P/n_s
I_S = (0.01 A)(2400 turns)/(300 turns)
I_S = 0.08 A
I_S = 80mA

 

[lacklustre]

Thanks Forbidden.

Stupid mistake on my behalf.