Question

1.A single light bulb is connected to a 12 V battery. The light bulb uses 55 W of power (which is about what a car’s headlight uses).

(a) What is the current flowing out of the high-voltage (+) end of the battery?  
(b) What is the current flowing into the low-voltage (-) end of the battery?  
(c) The battery has a sticker on it that says “This 12V battery contains 50 Amp-hours.” This indicates Amps × hours that the battery can provide, also written as “Ah.” How long could this battery run the light bulb described in part (a)?  
(d) What is the total amount of energy stored in this battery?

3. A “cathode ray tube” is what you find in the old style “tube” televisions. It has a large, glass tube with no air in it (vacuum). In the back, there is a source of electrons and the voltage is 30,000 volts. The front surface of the tube has a thin layer of powder, which is at a voltage of zero. (This is known as “ground” potential) If an electron starts at rest on the back surface, how fast is it going when it hits the front surface? Hint: assume that the total energy is conserved, that electric potential energy converts to kinetic energy, and no energy is lost to friction. The mass of the electron is 9.1 × 10-31 kg, the charge of the electron is 1.6 × 10-19 coulomb.


  
4. Find the resistance in ohms of a light bulb that produces 60 W of power when connected to 120 V household current.  

5. Indicate if the statements below are true or false:

(a) AC currents are changing, and the voltage is constant

(b) DC currents are constant, and the voltage is constant

(c) The time dependence of AC current and voltage follows a “sin” wave with frequency 60 Hz

(d) When several light bulbs are arranged in a series combination, if one bulb burns out then the other lights stay on.

(e) When several light bulbs are arranged in a parallel combination, if one bulb burns out then the other lights stay on.

Answer 1

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