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

Question

The wiring in the wall of your house to and from an outlet has a total resistance of typically 0.10 . Suppose a device plugged into a 120 V outlet draws 13.4 A of current.

Part A

What is the voltage drop along the wire?

Express your answer to two significant figures and include the appropriate units.

Part B

How much power is dissipated in the wire?

Express your answer to two significant figures and include the appropriate units.

Part C

What is the voltage drop across the device?

Express your answer to three significant figures and include the appropriate units.

Part D

At what rate does the device use electric energy?

Express your answer to two significant figures and include the appropriate units.

Explanation / Answer

(a)Voltage drop along wire = current*(resistance of wire)

Vr = 13.4 * 0.1

Vr = 1.34 V

b. Power dissipated in wire = Voltage*current

P = 1.34 *13.4

P =18 W

(c) Voltage drop across device = 120 - voltage drop across wire

Vdrop = 120-1.34

Vrdrop = = 118.66 V

(d) Power = voltage *current =

P = 118.66 * 13.4

P = 1542.58 W

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