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This print-out should have 7 questions. 005 10.0 points Multiple-choice questions may continue on If a metal wire carries a current of 110 mA, the next column or page find all choices how long does it take for 6.10x1020 electrons before to pass a given cross-sectional area anywhere along the wire? The fundamental charge is 001 10.0 points 1.602 x 10 The compressor on an air conditioner draws r in units of s 89.1 A when it starts up. The start-up time is about 0.243 s 006 10.0 points How much charge passes a cross-sectional The current in a lightning bolt is 5.0 x 105 A. area of the circuit in this time? How much charge passes through a cross- Answer in units of C sectional area of the lightning bolt in 3.1 s? r in units of C 002 10.0 points An automobile battery is an example of a 007 10.0 points In a particular television picture tube, the 1. dry ce measured beam current is 75.7 pu A How many electrons strike the tube screen 2. thermocouple. every 19 s? The fundamental charge is 19 1.602 x 10 wet cell r in units of electrons 4. fuse 003 10.0 points When electrons move back and forth, revers- ing their direction regularly, the current is called 1. induced current a short circuit alternating current 4. direct current 004 10.0 points The total charge that an automobile battery can supply without being recharged is given in terms of Ampere-hours. A typical 12-V battery has a rating of 72 A h. Suppose you forget to turn off the headlights in your parked automobile If each of the two headlights draws 1.6 A find out the time before your battery is dead" Answer in units of h

Explanation / Answer

1. apply current i = charge/time

so charge Q = it   = 89.1 * 243   =21.65 C

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2. dry cell

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3. alternating currernt

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4. apply iA = carge

time t = 72/1.6

t =45 hrs

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5. apply i = Q/t

and Q = ne

so t = ne/i

t = 6.1*10^20 * 1.6*10^-19/0.111

t = 879.29 secs

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6. apply Q = it

Q = 5*10^5 * 3.1

Q = 1.55 *10^6 C

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7. apply i = Q/t

Q = 75.7*10^-6 * 19

Q = 1.438 *10^-3 C

now use q= ne

n = 1.438*10^-3/1.6*10^-19

n = 8.98 *10^20 eelctrons

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