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1. A current of 200 mA flows for 2 minutes. How much charge has passed?
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- A 12-V car battery is used to power a 20.00-W, 12.00-V lamp during the physics club camping trip/star party. The cable to the lamp is 2.00 meters long, 14-gauge copper wire with a charge density of n=9.501028m3 . (a) What is the current draw by the lamp? (b) How long would it take an electron to get from the battery to the lamp?Integrated Concepts (a) What energy is dissipated by a lightning bolt having a 20,000-A current, a voltage of 1.00102 MV, and a length of 1.00 ms? (b) What mass of tree sap could be raised from 18.0°C to its boiling point and then evaporated by this energy, assuming sap has the same thermal characteristics as water?A Van de Graaff generator is one of the original particle accelerators and can be used to accelerate charged particles like protons or electrons. You may have seen it used to make human hair stand on end or produce large sparks. One application of the Van de Graaff generator is to create X-rays by bombarding a hard metal target with the beam. Consider a beam of protons at 1.00 keV and a current of 5.00 mA produced by the generator, (a) What is the speed of the protons? (b) How many protons are produced each second?
- (a) A defibrillator passes 12.0 A of current through the torso of a person for 0.0100 s. How much charge moves? (b) How many electrons pass through the wires connected to the patient? (See figure two problems earlier.)5. A typical lightning bolt has an average current of 3×104A lasting 0.2 s. How much charge is delivered to the ground by the lightning bolt? а. 9,000 C b. 7,000 C с. 8,000 C d. 6,000 CQ1. How many electrons per second are necessary to produce 1.0 nA of current? (e = 1.60 × 10-19 C) Q3. A +7.5 nC point charge is 5.0 cm from a -9.4 µC point charge in your laboratory in California. How much work would you have to do if you left the +7.5-nC charge in the lab but took the -9.4 µC charge to New York City? If you then released the +7.5, how much KE would it have once it returned to Cali? 3 parallel + 1 in series – Find Req Q5. How would you reduce Req of a circuit by adding a resistor – numerical piece to follow.
- 1. Electron guns are used in X-ray tubes. The electrons are accelerated through a relatively large voltage and directed onto a metal target, producing X-rays. (a) How many electrons per second strike the target if the current is 0.5 mA? electrons per second (b) What charge strikes the target in 0.6 s? ΔΟΞ CAn electric device delivers a current of 0.5 A for 10 seconds. How many electrons (1.6x10-19C) flow through this device? Select one: O a. 2 O b. 20 O c. 200 O d. 0.31x1020 О е. 3.1x10201. If electricity costs 15 Bz per kilowatt-hour, how much does it cost to operate a 220 V water heater that draws 5 A of current for 3 hours per day for a month of thirty days? The Total Electrical energy consumed for a month = kwh and the Total cost of electricity consumption = riyal 2. If current of I = 3.00 A flows through a wire, How many number of electrons flow through a point in a wire in 3.00 s ? Number of electrons flow through a point in wire in 3.00 s = electrons
- 5. How many free electrons are there in a rectangular block of a conductor whose dimension is 8 m by 4 m by 3 m? The electrons of this conductor have a drift velocity of 4 m/s when a 9.6 A of current is applied thru a cross-sectional area of 0.005 m?. Use electronic charge of 1.6 x 10-19 coulomb per electron. Express your answer in scientific notation whose unit is electrons per cubic meter.1. Consider a cylindrical wire that has conduction electron density 6.0 x 1028 and radius 0.5 mm. An electric field with strength 1 m3 7.5 x 10-4 creates a current of 4.8 × 10" electrons per second. a) What is the average drift speed for an electron? (include units) b) What is the average time in between electron collisions? fs (express your answer in femtoseconds)280 CHAPTER 6. ELECTRONICS .6.17 How many electrons will pass through a cylindrical copper wire of diameter 0.8 mm in 3.0 s, if the wire has a current density of 1.55 x 105 A/m2?