(a) What is the voltage output of a transformer used for rechargeable flashlight batteries if its primary has 500 turns, its secondary has 8 turns, and the input voltage is 124 V? V (b) What input current is required to produce a 4.00 A output? mA (c) What is the power input? W

(a) 1.984 V

(b) 0.064 A

(c) 7.94 Watt

Explanation:

number of turns in primary coil, Np = 500

number of turns in secondary coil, Ns = 8

Voltage in primary coil, Vp = 124 V

(a)

Let the output voltage is Vs.

By using the formula for the transformer

Vs = 1.984 V

(b)

Let the input current is Ip.

Output current, Is = 4 A

Ip = 0.064 A

(c)

Input power, P = Vp x Ip

P = 124 x 0.064

P = 7.94 Watt

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