| A | B |
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| In the diagram shown above, the circles represent small balls that have electric charges. Ball 1 has a negative charge, and ball 2 is repelled by ball 1. Next, you see that ball 2 repels ball 3 and that ball 3 attracts ball 4. What is the electric charge on ball 4? | Ball 4 has a positive charge. |
| The figure shown above demonstrates charging by | Polarization |
| A flashlight bulb with a potential difference of 4.5 V across it has a resistance of 8.0 Ω. How much current is in the bulb filament? | 0.56 A |
| A lightbulb has a resistance of 240 Ω when operating at 120 V. What is the current in the lightbulb? | 0.50 A |
| How much does it cost to operate a 695 W heater for exactly 30.0 min if electrical energy costs $0.060 per kw*h? | $0.02 |
| A color TV draws about 2.5 A when it is connected to a 120 V outlet. Assuming electrical energy costs $0.060 per kw*h, what is the cost of running the TV for exactly 8h? | $0.30 |
| What happens when the switch is closed in the circuit shown above? | The lamp goes out because the battery terminals connect to each other. |
| Three resistors with values of R1, R2, and R3 are connected in series. Which of the following expresses the total resistance, R eq, of the threee resistors? | R eq=R1+R2+R3 |
| What is the equivalent resistance of the resistors in the figure shown above? | 10 Ω |
| Three resistors connected in parallel have individual values of 4.0 Ω, 6.0 Ω, and 10.0 Ω, as shown above. If this combination is connected in series with a 12.0 V battery and a 2.0 Ω resistor, what is the current in the 10.0 Ω resistor? | 0.58 A |
