1. Does current or voltage perform the work in a circuit? 2. List six forms of energy that can be used to produce electricity. 3. How are secondary cells rated? 4. Draw a series-parallel combination that will supply 9 volts at 1 ampere. Use 1 's-volt cells rated at 250 milliamperes. 5. What is the voltage drop across three lamps of 3 volts, 3 volts, and 6 volts with 9 volts applied? 6. What is the voltage and current of two 12 -volt, 600 ampere batteries connected in series, and then connected in parallel with two more 12-volt, 600 ampere batteries connected in series? 7. What is one way that a circuit uses the excess energy flowing in a circuit? 8. How does the current flow in a circuit from a battery? 9. What is the difference between ground's use in home, automobiles, and electronics? 10. Make a chart showing the formulas used for series and parallel for voltage and current in a dircuit