COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 18, Problem 28QAP
To determine
The current provided by the battery in a cellular phone.
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A typical lightning bolt may last for 0.200 s and transfer 1.00 x1020 electrons. Calculate the average current in the lightningbolt.
A 200-m long copper wire of radius 0.15 mm is connected across a 6-V battery. Calculate the current passing through the wire
Problem 1: A cell phone battery uses chemistry to create a charge separation between the terminals (anode and cathode). Such a battery is listed as having a capacity of Q = 7.5E-08 C.
Part (a) How many free electrons does the battery contain, N?
Part (b) If there are 1.0 million electrons moving through the phone every second how long will the battery last in seconds?
Part (c) Current, I, is given in amps which are coulombs per second. What is the current passing through the phone?
Chapter 18 Solutions
COLLEGE PHYSICS
Ch. 18 - Prob. 1QAPCh. 18 - Prob. 2QAPCh. 18 - Prob. 3QAPCh. 18 - Prob. 4QAPCh. 18 - Prob. 5QAPCh. 18 - Prob. 6QAPCh. 18 - Prob. 7QAPCh. 18 - Prob. 8QAPCh. 18 - Prob. 9QAPCh. 18 - Prob. 10QAP
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- Using this information, estimate the following quantities (a) total amount of charge transferred between cloud and ground (b) the current in the lightning bolt (c) the power delivered in 0.2 s. Given data: Energy transferred U- 10° K Voltage V 5 x 107 V Time t=0.25 Charge q= ? Current I=? Power delivered in 0a?arrow_forwardQuestion 4 (a) A gasolene generator converts energy into electrical energyz (6) The Speed at which an electron moves in a se electric field in a conductor is the (c) Which of the following wires. have the greatest resistance? would (a) aluminum wire 10cm length and 3 cm diameter. (b) aluminum wire 10cm L and 5cm diameter (aluminum wire 5cm L and 3cm diamet aluminum wire 5cm L and 5cm diameter. (d)arrow_forwardA 5-meter-long conductor with diameter of 5mm is connected to a source and an external resistance. The temperature of the conductor changes from 25 degrees to 35 degrees. Determine the resistivities and resistances at each temperature. Thermal coefficient of the conductor is 40 x 10-³and the conductivity at 20°C is 2.5465 x 10 4 per ohm-meterarrow_forward
- (a) A 35.5-m length of copper wire at 20.0°C has a radius of 0.23 mm. If a potential difference of 7.0 V is applied across the length of the wire, determine the current in the wire. (Use the values in the following table.) Resistivities and Temperature Coefficients of Resistivity for Various Materials (at 20°C) Material Silver Copper Gold Aluminum Tungsten Iron Platinum Lead Nichromea Carbon Germanium Silicon Glass Hard rubber Sulfur Quartz (fused) Resistivity (2. m) 1.59 x 107 1.7 x 10-8 2.44 x 10-8 2.82 x 10 5.6 x 10 10.0 x 10 -8 -8 22 x 107 -8 11 x 10-8 0.46 640 -8 -8 150 x 10 -8 3.5 x 10-5 1010-1014 ≈1013 1015 75 x 1016 Temperature Coefficient of Resistivity [(°C)-¹] 3.8 x 10-3 3.9 x 10 3.4 x 10 -3 4.5 x 10 -3 3.9 × 10-3 -3 5.0 × 10-3 3.92 x 10-3 3.9 x 10 -3 0.4 x 10-3 -0.5 x 10-3 -48 x 10-3 -75 x 10-3 aA nickel-chromium alloy commonly used in heating elements. 2.76E17 Calculate the resistance of the wire and use the value you calculate to find the current. A (b) If the wire is…arrow_forwardDuring lightning strikes from a cloud to the ground, a current of 20 kA occured and lasted for about 55-us. How much charge is transferred from the cloud to the earth during the strike?arrow_forwarda- find the current through a copper wire if Q= 3 mc crosses in 3 minutes b- find the electric charge Q that passes through this wire if a current I = 3 A flows during 30 sarrow_forward
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