1. Find the current when 2.50 nC jumps between your comb and hair over a 0.800-?s time interval.

2. A clock battery wears out after moving 10600 C of charge through the clock at a rate of 0.530 mA. How long did the clock run? How many electrons per second flowed?

3. Calculate the effective resistance of a pocket calculator that has a 1.39-V battery and through which 0.170 mA flows.

4. What is the effective resistance of a car's starter motor when 160 A flows through it as the car battery applies 12.5 V to the motor?

5. If the 0.115-mm diameter tungsten filament in a light bulb is to have a resistance of 0.370 ? at 20.0C, how long should it be?

6. What power is supplied to the starter motor of a large truck that draws 300 A of current from a 24.1-V battery hookup?

7. What is the power output of a flashlight if 5.7010² C pass through it in 0.410 h and its voltage is 2.80 V?

8. Electrons in an X-ray tube are accelerated through 1.1910² kV and directed toward a target to produce X-rays. Calculate the power of the electron beam in this tube if it has a current of 14.0 mA.

9. A cauterizer, used to stop bleeding in surgery, puts out 1.80 mA at 14.0 kV. What is its power output? What is the resistance of the path?

10. A rectangular solid made of carbon has sides lying along the x, y, and z axes, whose lengths are 1.07 cm, 2.14 cm, and 4.28 cm, respectively, as seen in figure below. Determine the resistance for current that flows through the solid in the x direction. Assume the resistivity is ? = 3.00E-5 ?* m.