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ConcepTest 19.1aSeries Resistors I 9 V 1) Assume that the voltage of the battery is 9 V and that the three resistors are identical. What is the potential difference across each resistor? 1) 12 V 2) zero 3) 3 V 4) 4 V 5) you need to know the actual value of R

ConcepTest 19.1bSeries Resistors II 12 V R 1 = 4  R 2 = 2  2) In the circuit below, what is the voltage across ? 2) In the circuit below, what is the voltage across R 1 ? 1) 12 V 2) zero 3) 6 V 4) 8 V 5) 4 V

ConcepTest 19.2aParallel Resistors I 3) In the circuit below, what is the current through ? 3) In the circuit below, what is the current through R 1 ? 10 V R 1 = 5  R 2 = 2  1) 10 A 2) zero 3) 5 A 4) 2 A 5) 7 A

ConcepTest 19.2bParallel Resistors II 1) increases 2) remains the same 3) decreases 4) drops to zero 4) Points P and Q are connected to a battery of fixed voltage. As more resistors R are added to the parallel circuit, what happens to the total current in the circuit?

ConcepTest 19.3aShort Circuit 5) Current flows through a lightbulb. If a wire is now connected across the bulb, what happens? all the current continues to flow through the bulb 1) all the current continues to flow through the bulb half the current flows through the wire, the other half continues through the bulb 2) half the current flows through the wire, the other half continues through the bulb all the current flows through the wire 3) all the current flows through the wire none of the above 4) none of the above

ConcepTest 19.3bShort Circuit II 6) Two lightbulbs A and B are connected in series to a constant voltage source. When a wire is connected across B, bulb A will: glow brighter than before 1) glow brighter than before glow just the same as before 2) glow just the same as before glow dimmer than before 3) glow dimmer than before 4) go out completely 5) explode

ConcepTest 19.4aCircuits I circuit 1 1) circuit 1 circuit 2 2) circuit 2 both the same 3) both the same it depends on R 4) it depends on R 7) The lightbulbs in the circuit below are identical with the same resistance R. Which circuit produces more light? (brightness  power)

ConcepTest 19.4bCircuits II twice as much 1) twice as much the same 2) the same 1/2 as much 3) 1/2 as much 1/4 as much 4) 1/4 as much 4 times as much 5) 4 times as much 10 V A B C 8 ) The three lightbulbs in the circuit all have the same resistance of 1  By how much is the brightness of bulb B greater or smaller than the brightness of bulb A? (brightness  power)

ConcepTest 19.5aMore Circuits I increase 1) increase decrease 2) decrease stay the same 3) stay the same 9) What happens to the voltage across the resistor R 1 when the switch is closed? The voltage will: V R1R1 R3R3 R2R2 S

ConcepTest 19.5bMore Circuits II increases 1) increases decreases 2) decreases stays the same 3) stays the same V R1R1 R3R3 R4R4 R2R2 S 10) What happens to the voltage across the resistor R 4 when the switch is closed?

ConcepTest 19.6ircuits ConcepTest 19.6Even More Circuits 11) Which resistor has the greatest current going through it? Assume that all the resistors are equal. V R1R1 R2R2 R3R3 R5R5 R4R4 1) R 1 and 2) both R 1 and R 2 equally and 3) R 3 and R 4 4) R 5 5) all the same

ConcepTest 19.7Junction Rule ConcepTest 19.7 Junction Rule 1) 2 A 2) 3 A 3) 5 A 4) 6 A 5) 10 A 5 A 8 A 2 A P 12) What is the current in branch P?

ConcepTest 19.8Kirchhoff’s Rules ConcepTest 19.8 Kirchhoff’s Rules 13) The lightbulbs in the circuit are identical. When the switch is closed, what happens? 1) both bulbs go out 2) intensity of both bulbs increases 3) intensity of both bulbs decreases 4) A gets brighter and B gets dimmer 5) nothing changes

ConcepTest 19.9Wheatstone Bridge 1) I 2) I/2 3) I/3 4) I/4 5) zero 14) An ammeter A is connected between points a and b in the circuit below, in which the four resistors are identical. The current through the ammeter is: I Vab

ConcepTest 19.10Kirchhoff’s Rules ConcepTest More Kirchhoff’s Rules 2 V 2  2 V 6 V 4 V 3  1  I1I1 I3I3 I2I2 15) Which of the equations is valid for the circuit below? 1) 2 – I 1 – 2I 2 = 0 2) 2 – 2I 1 – 2I 2 – 4I 3 = 0 3) 2 – I 1 – 4 – 2I 2 = 0 4) I 3 – 4 – 2I = 0 5) 2 – I 1 – 3I 3 – 6 = 0

ConcepTest 19.11aCapacitors I ConcepTest 19.11a Capacitors I o o C C C C eq 1) C eq = 3/2 C 2) C eq = 2/3 C 3) C eq = 3 C 4) C eq = 1/3 C 5) C eq = 1/2 C 16) What is the equivalent capacitance,, of the combination below? 16) What is the equivalent capacitance, C eq, of the combination below?

ConcepTest 19.11bCapacitors II ConcepTest 19.11b Capacitors II 1) V 1 = V 2 2) V 1 > V 2 3) V 1 < V 2 4) all voltages are zero C 1 = 1.0  F C 3 = 1.0  F C 2 = 1.0  F 10 V 17) How does the voltage V 1 across the first capacitor (C 1 ) compare to the voltage V 2 across the second capacitor (C 2 )?

ConcepTest 19.11cCapacitors III ConcepTest 19.11c Capacitors III C 1 = 1.0  F C 3 = 1.0  F C 2 = 1.0  F 10 V 1) Q 1 = Q 2 2) Q 1 > Q 2 3) Q 1 < Q 2 4) all charges are zero 18) How does the charge Q 1 on the first capacitor (C 1 ) compare to the charge Q 2 on the second capacitor (C 2 )?