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Electric currents and circuits

Electric currents and circuits. Is it possible to light a bulb with a battery using only one wire?. Yes No I have no idea. Which of the arrangements shown will light the bulb?. Only A Only B Only C Only D Only E Only F A & C B & F D & E.

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Electric currents and circuits

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  1. Electric currents and circuits

  2. Is it possible to light a bulb with a battery using only one wire? • Yes • No • I have no idea NEXUS/Physics Clicker Questions

  3. Which of the arrangements shown will light the bulb? • Only A • Only B • Only C • Only D • Only E • Only F • A & C • B & F • D & E NEXUS/Physics Clicker Questions

  4. In the two cases shown here a battery is connected to a box containing some identical bulbs. The battery maintains a constant potential difference V0. across its terminals. Which bulbs will be brighter? • A in #1 • B in #1 • A and B in #1 (equal) • A in #2 • B in #2 • A and B in #2 (equal) • All 4 equal • Other NEXUS/Physics Clicker Questions

  5. Charge flows through a light bulb. Suppose a wire is connected across the bulb as shown. When the wire is connected, • all the charge continues to flow through the bulb. • half the charge flows through the wire, the other half continues through the bulb. • all the charge flows through the wire. • none of the above

  6. This circuit has two identical light bulbs burning with equal brightness and a single 12 V battery. When the switch is closed, the brightness of bulb A • increases • decreases • decreases to 0 • remains the same NEXUS/Physics Clicker Questions

  7. This circuit has two identical light bulbs burning with equal brightness and a single 12 V battery. When the switch is closed, the brightness of bulb B • increases • decreases • decreases to 0 • remains the same NEXUS/Physics Clicker Questions

  8. Which of the bulbs in the following circuit is (are) the brightest? • A • B • C • D • B and C • A and D • Something else • You can’t tell from the information given NEXUS/Physics Clicker Questions

  9. Sample Problem • How do the currents in resistors A and B compare? • How do the voltage drops across resistors A and B compare? • How does the current in and voltage drop across resistor C compare to those in A and B? • Find the current in resistor D. (R) (2R) (3R) NEXUS/Physics Clicker Questions (R) (V0) I0 = V0 /R

  10. Sample Problem • If bulb D is removed from its socket, how does the brightness of the three bulbs A, B, and C change? (R) (2R) (3R) NEXUS/Physics Clicker Questions (R) (V0) I0 = V0 /R

  11. Sample Problem • If bulb D is put back in its socket, and now bulb C is removed, rank the brightness of the three bulbs A, B, and D? (R) (2R) (3R) NEXUS/Physics Clicker Questions (R) (V0) I0 = V0 /R

  12. Use Kirchhoff's principles to find: • the current through each of the bulbs and • the current through each of the batteries. NEXUS/Physics Clicker Questions #1 = 6V #2 = 3V A = B = C = 3Ω

  13. What can you say about the voltage at the points A, B, and C? • The magnitudes of the voltages at A and B add up to the magnitude of the voltage at C. • The sum of the magnitudes of the voltages at two of the points adds up to the magnitude of the voltage at the third (but we can’t say which). • The magnitude of the voltages at all three points are equal. • There is not enough information to draw any of the above conclusions. • Something else.

  14. What can you say about the currents at the points A, B, and C? • The magnitudes of the currents flowing through A and B add up to the magnitude of the current flowing through C. • The sum of the magnitudes of the currents at B and C add up to the magnitude of the current through A. • The sum of the magnitudes of the currents at A and C add up to the magnitude of the current through B. • The magnitude of the currents flowing through all three points are equal. • There is not enough information to draw any of the above conclusions. • Something else

  15. In what direction is the current at point C flowing? • To the left. • To the right. • It is zero. • There is not enough information to draw any of the above conclusions. • Something else.

  16. What can you say about the voltage at the point C given that we take the voltage at the bottom of the battery to be 0?(V0 = 9 V; R = 3 Ω ) • It is zero. • It 9 Volts. • It is 3 Volts. • It is 4.5 Volts. • There is not enough information to draw any of the above conclusions. • Something else.

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