A small light-bulb draws 0.22-A current from a 6-V battery. In 2 min: a)  How much energy does the battery supply? b)  How many electrons passes through a point in the circut every second?

IN 77. If electric power is transmitted over long distances, the resistance of the wires becomes significant. Why? Which method of transmission would result in less they ofte wires. W F6 84. (a) energy wasted-high current and low voltage or low current and high voltage? Explain your answer. resistane V and b i potentia V is ap 78. The ideal batteries have emfs 12 V and %3D 6.0 V. What are (a) the current current, the dissipation rate in (b) resistor 1 (4.0 2) and (c) resistor 2 (8.0 2), and the energy transfer rate in (d) battery 1 and (e) battery 2? Is energy being supplied or absorbed by (f) battery 1 and (g) battery 2? 79. Consider 85. A series, a applied capacit 4F constar 10.0 2 25.0 V capacit the circuit shown. Find (a) 10.0 2 86. Cc the current the 20.0-2 resistor and (b) potential difference between points a and b. the 20.0 2 75 00'S 80. An automobile battery has an emf of 12.6 V and an internal resistance of 0.0800 2. The headlights together present equivalent resistance 5.00…

A room with 2.9-mm-high ceilings has a metal plate on the floor with V = 0V and a separate metal plate on the ceiling. A 1.1 g glass ball charged to 4.9 nC is shot straight up at 5.0 m/s . How high does the ball go if the ceiling voltage is −2.8×106 V ?

The electric field inside a 30-cm-long copper wire is 0.010 V/m. What is the potential difference between the ends of the wire?

A 3.31 volt potential difference is placed across a 1,957.08 ohm resistor. How many electrons pass through the resistor in 3.36 seconds? (e = 1.602x10-19 C)

A battery-operated car utilizes a 12.0 V system. Find the charge the batteries must be able to move in order to accelerate the 750 kg car from rest to 25.0 m/s, make it climb a 2.00×102 m high hill, and then cause it to travel at a constant 25.0 m/s by exerting a 5.00×102 N force for an hour.

4. What value resistor will discharge a 1.0 µF capacitor to 10% of its initial charge in 2.0 ms?

A) if a current in a wire is 5.0 A, how many coulombs of charge pass a point in the wire in 1 min? B) what is the current if 6.0x10^3 C pass a point in a circuit in 10.0 min? C) if a current in a circuit is 12 A , how many electrons pass a point in 1h?

Part A: A resistor has a current of 50 mA and an electrical resistance of 5 k ohms. What is the voltage drop across the resistor? Part B: A capacitor with a capacitance of 14 F has a charge of 15 C stored on it. What is the voltage change across the capacitor?

9. A capacitor of 5000 µF is charged by a 12 V supply and then discharged through a 150 Q resistor. Calculate (a) its initial charge, (b) the time constant (c) the charge remaining after 1.5 seconds.