Question

# What is the voltage output of a transformer used for rechargeable flashlight batteries if its primary...

What is the voltage output of a transformer used for rechargeable flashlight batteries if its primary has 525 turns, its secondary has8 turns, and the input voltage is 112 V?
V

(b) What input current is required to produce a 4.00 A output?
mA

(c) What is the power input?
W

Given:

Input voltage (Vp) = 112 V

Primary turns (np)= 525

Secondary turns (nS) = 8

Input current (Ip) = 4.00 A

Here, A transformer consists of two coils - the primary coil and the secondary coil both wound on a soft iron core.

Using the formula,

Secondary voltage (Vs)/ Primary voItage (VP) = Secondary turns (nS)/ Primary turns (nP)

Secondary voltage (Vs) = (8 * 112 V) / 525

= 1.706 V

Similarly, Secondary Current (Is)/ Primary Current (IP) = Secondary turns (nS)/ Primary turns (nP)

Primary Current (IP) = (4 A * 525)/8

=262.5 A

c) Power input (Pp) = Ip * Vp = 262.5 * 112

= 29400 W

= 29.4 kW