Phys-131 Fundementals of Physical ScienceHomework Set #3Laura Davion1. A dry cell does 7.5 J of work through chemical energy transfer 5.00 C between terminals of the cell. What is the electric potential between the two terminals?2. An electric current through a wire is 6.00 C every 2.00 sec. What is the magnitude of this current?3. There is a current of 4.00 through a toaster connected to a 120.0 C circuit. What is the resistance of the toaster?4. What is the current in a 60.0 coulomb resistor when the potential difference across it is 120.0?5. A light bulb with a resistance of 10.0 coulomb allows a 1.20 A current to flow when connected to a battery. (a)What is the voltage of the battery? (b) What is the power of the light bulb?6. A small radio operates on 3.00 V and has a resistance of 15.0 coulomb. At what rate does the radio use electric energy?7. A 1,200 W hair dryer is operated on a 120 V circuit for 15 minutes. If electricity costs $0.10/kW h, what was the cost of using the blow dryer?8. An automobile starter rated at 2.00 hp draws how many amps from a 12.0 V battery?9. Two 8.0 coulomb light bulbs are connected in a 12 V series circuit. What is the power of both glowing bulbs?10. Three resistors with a resistance of 12 ohms, 8 ohms, and 24 ohms are in a series circuit with a 12 volt battery.(a.)What is the total resistance of the resistors?(b.) How much current can move through the circuit?11. Assume the three resistances of 12 ohms, ohms, and 24 ohms are connected in parallel.(a.)What is the total resistance?(b.)What is the current in the overall circuit?(c.)What is the current through each resistance?12. What is the cost of operating a 100 W light bulbs for 1.00 hour if the utility rate is $0.10/ k Wh?13.A 1,100 W hair dryer is designed to operate on 120 V. How much current does the dryer require?14. An electric fan is designed to draw 0.5 A in a 120 V circuit. What is the power rating of the fan?15. a light bulb in a 120 V circuit is switched on, and a current of 0.5 A flows through the filament. What is the resistance of the bulb?16. There is a current of 0.83 A through a lighbulb in a 120 V circuit. What is the resistance of this lightbulb?
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