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It is the time rate of change
A. Charge
B.
C. Potential Difference
D. Resistance
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- 5. A typical lightning bolt has an average current of 3:10^44 lasting 0.2 s. How much charge is delivered to the ground by the lightning bolt? a. 9,000 C b. 7,000 C c. 8,000 C d. 6,000 C18. What physical quantity does one need to plot on the vertical axis to obtain a graph of the type shown in figure 4, relating to a charging capacitor. Y Figure 4 Time /s Potential difference B Charge C Capacitance D CurrentThe unit of electric current, the ampere, is equivalent to which of the following? a. V?Ω b. V/Ω c. Ω?m d. V/s
- If a quantity you calculated has units of kg .m2 / S.C2 what is that quantity? Select one: O A. potential O B. B. resistivity C. capacitance O D. current O E. resistanceQ4. In the figure R = 2 kn, how much current flows through the 12 V battery? a) 2 mA b) 3 mA 4 mA d) 6 mA www R ww R wIf the length of a cylindrical conducting wire doubles and its radius also doubles, then the resistance of the wire __________. a. halves b. decreases by a factor of two c. doubles d. increases by a factor of four e. does not change
- If a certain resistor obeys Ohm's Law, its resistance will change __. a. none of the above b. as the voltage across the resistor changes. c. as the current through the resistor changes. d. as the electric field inside the resistor changes.___12. Electrons are made to flow in a wire when there is:A. an imbalance of charges in the wire.B. a potential difference across its ends.C. more potential energy at one end of the wire than the other ___13. Which statement is correct?A. Current causes voltage.B. Current flow through a circuit.C. Voltage flows a through a circuit.D. Resistance is established across a circuit. ___14. When you stretch a copper wire so that it becomes thinner, the resistance between itsends:A. increasesB. decreasesC. remains unchanged ___15. A power line with a resistance of 2 ohms has a current of 80 A current in it. The powerdissipated in the line is:A. 40 W C. 320 WB. 160 W D. 12800 WIn Drude's model of electrical conduction, current density is not directly proportional to a.the number of charge carriers per unit volume. b.the average time interval between successive collisions. c.the square of the electron charge. d.the electric field present in the wire. e.the resistivity of the wire.
- In general, overcurrent protective devices are inserted where the conductor receives its ___. a. Groundingb. Supplyc. TerminationQ1. 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.Fig. 4 P4- 10V ¡Ohm's law, power] a) In Fig. 4, what is the current in R₁? Ans. b) The current in R₂? Ans. 0.11 A c) The current on R₂? Ans. d) The voltage on R.? Ans. Ľ www R₁=200 0.06 A 3.4 V www R₁-200 0.17 A R₂=300 ww www e) the electric power on R₁? Ans. R₂=500 0.58 W