SAT Circuits

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 The graphs below show characteristics of electrical components. 1. Which of the graphs above shows how the current (y axis) varies with the voltage applied for a resistor that obeys ohm's law? ? A B C D E 2. Which of the graphs above shows how the voltage (y axis) varies with time as a capacitor is discharged ? ? A B C D E 3. Which of the following graphs shows how the resistance of a filament lamp varies with voltage? ? A B C D E 4. A circuit is set up to investigate the I-V characteristics of a bulb, over the full range of voltage available . It includes a variable resistor used as a potential divider. Which of these shows the correct arrangement of the components? ? A B C D E 5. The graph shows how the current varies in an unknown component. At x, the tangent T has a gradient of m. The resistance of the component at x is:   A. V/I B. I/V C. m D. m2 E. 1/m ? A B C D E These 4 resistor networks are made using identical resistors. 6. Which network has the highest resistance? ? A B C D E 7. Which network would have the largest current flowing through it when connected to identical cells? ? A B C D E A battery of e.m.f. 12V ( and negligible internal resistance) is connected to a resistor. 30C of charge flows through the resistor in one minute. 8.What is the current flowing? A. 0.2A B. 0.4A C. 0.5A D. 2A E. 2.5A ? A B C D E 9. What is the power dissipated in the resistor? A. 2.5W B. 6W C. 24W D. 130W E. 360W ? A B C D E 10. What is the value of the resistor? A. 0.4 Ω B. 2.5 Ω C. 12 Ω D. 20 Ω E. 24 Ω ? A B C D E