9. The battery for a particular cell phone is rated at 3.70 V. According to the
ID: 3161053 • Letter: 9
Question
9. The battery for a particular cell phone is rated at 3.70 V. According to the manufacturer, it can provude 3.15 × 104 J of electrical energy, which is enough for 5.25 h of operation, before needing to be recharged. What is the average current this cell phone draws when turned on?
0.450 A
0.167 A
0.189 A
0.370 V
10.
0.75 A
4.5 A
2.25 A
6.4 A
9.5 A
12. If you scuff electrons onto your shoes while walking across a rug, are you negatively or positively changed?
24 µm
6.0 µm
2.2 µm
12 µm
0.75 A
4.5 A
2.25 A
6.4 A
9.5 A
12. If you scuff electrons onto your shoes while walking across a rug, are you negatively or positively changed?
13. A 1.0 m length of metal wire is connected to a battery, and a current of flows through it. What is the diameter of the wire? The resistivity of the metal is
24 µm
6.0 µm
2.2 µm
12 µm
162 LAN- 20 2 ANA 8 2 ANA 6 2 22Explanation / Answer
here,
9)
voltage of the cell phone battery , V = 3.7 V
time taken , t = 5.25 h
t = 5.25 * 3600 = 18900 s
let the current be I
energy provided , E = 3.15 * 10^4 J
V * I * t = 31500
3.7 * I * 18900 = 31500
I = 0.45 A
the average current this cell phone draws when turned on is 0.45 A
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