Physics Homework Chapter 17

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1. A current of 79.0 mA exists in a metal wire.
(a) How many electrons flow past a given cross section of the wire in 10.8 min?
_____electrons
(b) In what direction do the electrons travel with respect to the current?
-The magnitude is zero.
-opposite direction   
-same direction




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2. The current supplied by a battery in a portable device is typically 0.183 A. Find the number of electrons passing through the device in two hours.
 
_____electrons


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3. An electric heater carries a current of 17.0 A when operating at a voltage of 3.30 X 10²V. What is the resistance of the heater?

_____Ω


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4. Nichrome wire of cross-sectional radius 0.781 mm is to be used in winding a heating coil. If the coil must carry a current of 10.00 A when a voltage of 2.70 X10^{2</ sup> V is applied across its ends, find the following.}
(a) the required resistance of the coil
_____Ω
(b) the length of wire you must use to wind the coil
_____m


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5. A wire of diameter 0.550 mm and length 30.0 m has a measured resistance of 3.00 Ω. What is the resistivity of the wire?
_____Ω · m


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6. A potential difference of 10 V is found to produce a current of 0.45 A in a 3.6 m length of wire with a uniform radius of 0.35 cm. Find the following values for the wire:

(a) the resistance
_____Ω

(b) the resistivity
_____ Ω· m



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7. If a certain silver wire has a resistance of 3.00 Ω at 15.0°C, what resistance will it have at 29.0°C?
_____Ω


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8. Suppose your waffle iron is rated at 1.25 kW when connected to a 1.80 X 10^{2</ sup> V source.}

(a) What current does the waffle iron carry?
_____A
(b) What is its resistance?
_____ Ω


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9.If electrical energy costs 12 cents, or $0.12, per kilowatt-hour, then what would the following events cost?
(a) burning a 40 W light bulb for 24 h straight
$_____  
(b) operating an electric oven for 4.0 h if it carries a current of 20.0 A at 220 V
$_____


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10. A high-voltage transmission line with a resistance of 0.30 /km carries a current of 1040 A. The line is at a potential of 660 kV at the power station and carries the current to a city located 160 km from the station.
(a) What is the power loss due to resistance in the line?
_____W
(b) What fraction of the transmitted power does this loss represent?
_____%


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