Can someone please help me with physics?

I cannot understand this problem. Please help me :( I would appreciate it a lot. Thank you much.

An AC adapter for a telephone answering unit uses a transformer to reduce the line voltage of 120 Volts (rms) to a voltage of 8.0 Volts. The rms current delivered to the answering system is 430 mA.

a. If the primary (input) coil in the transformer in the adapter has 240 turns, how many turns are there on the secondary (output) coil?

b. What is the rms power delivered to the transformer? Assume an ideal transformer.

a. N1/N2 = V1/V2 (TRANSFORMER RATIO)
240/N2 = 120/8
N2 = 16 TURNS
b. FOR AN IDEAL TRANSFORMER, INPUT POWER = OUTPUT POWER
POWER DERLIVERED = OUTPUT CURRENT x OUTPUT VOLTAGE
POWER = 430mA x 8 = 3.44 WATTS

The transformer equation is,
Ns/Np=Vs/Vp
Ns/240=8/120
Ns= (240 x 8) / 120
Ns = 16
The number of turns in the secondary=16.

Again,
If it is an ideal transformer no power is delivered to the transformer

Tags

　　Business Services 　　Business Address 　　Call Forwarding 　　Call Handling 　　Answering Service 　　Telephone Answering 　　Mail Forwarding 　　Virtual Address 　　Virtual Assistant 　　Virtual Business 　　Virtual Offices

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