Question

1. What is the emf of a battery that increases the electric potential energy of 0.050 C of charge by 0.60 J as it moves from the negative to the positive terminal?

2 .A thermistor is a device whose resistance varies with temperature. At 20∘C a thermistor's resistance is 10.0 kΩ. When connected to a 1.2 V battery, the current through the thermistor increases by 20 μA as the temperature increases to 30∘C. What is the thermistor's resistance at this higher temperature?

3.A rear window defroster consists of a long, flat wire bonded to the inside surface of the window. When current passes through the wire, it heats up and melts ice and snow on the window. For one window the wire has a total length of 11.0 m, a width of 1.6 mm, and a thickness of 0.11 mm. The wire is connected to the car's 12.0 V battery and draws 7.5 A. What is the resistivity of the wire material?

4.When running on its 11.4 V battery, a laptop computer uses 8.3 W. The computer can run on battery power for 5.0 h before the battery is depleted. A) What is the current delivered by the battery to the computer? B)How much energy, in joules, is this battery capable of supplying? C)How high off the ground could a 75 kg person be raised using the energy from this battery?

5. An electric eel develops a potential difference of 480 V , driving a current of 0.70 A for a 1.0 ms pulse. A) Find the power of this pulse. B)Find the total energy of this pulse. C) Find the total charge that flows during the pulse.

Answer 1