1. The wiring in the wall of your house to and from an outlet has a total resist

Question

1. The wiring in the wall of your house to and from an outlet has a total resistance of typically 0.14 . Suppose a device plugged into a 120 V outlet draws 14.6 A of current.

A. What is the voltage drop along the wire?

B. How much power is dissipated in the wire?

C. What is the voltage drop across the device?

2. A neon sign transformer has a 490W AC output with an rms voltage of 17 kV when connected to a normal household outlet. There are 500 turns of wire in the primary coil.

A. How many turns of wire does the secondary coil have?

B. When the transformer is running at full power, what is the current in the secondary coil?

C. The current in the primary coil?

No explanation required. Please just give answers. Thanks so much!

Explanation / Answer

1)
R = 0.14
v = 120 v
I = 14.6 A

(A)
Voltage drop along the wire, = I*R = 0.14*14.6
Voltage drop along the wire, = 2.044 V

(B)
Power dissipated in the wire, P = I^2*R
Power dissipated in the wire, P = 14.6^2*0.14 W
Power dissipated in the wire, P = 29.84 W

(C)
Voltage drop across device, = 120 - 2.044 = 117.95 V

2)
(a)
17000 volt sec/120 volts pri * 500 turns primary = 7.08 * 10^4 turns

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