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Download Chap. 19 Conceptual Modules Giancoli
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ConcepTest 1 Series Resistors I 1) 12 V 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? 2) zero 3) 3 V 4) 4 V 5) you need to know the actual value of R 9V ConcepTest 2 Series Resistors II 1) 12 V In the circuit below, what is the 2) zero voltage across R1? 3) 6 V 4) 8 V 5) 4 V R1= 4 W R2= 2 W 12 V ConcepTest 3 Parallel Resistors I 1) 10 A In the circuit below, what is the 2) zero current through R1? 3) 5 A 4) 2 A 5) 7 A R2= 2 W R1= 5 W 10 V ConcepTest 4 Parallel Resistors II Points P and Q are connected to a 1) increases battery of fixed voltage. As more 2) remains the same resistors R are added to the parallel 3) decreases circuit, what happens to the total 4) drops to zero current in the circuit? ConcepTest 5 Current flows through a lightbulb. If a wire with no resistance is now connected across the bulb, what happens? Short Circuit 1) all the current continues to flow through the bulb 2) half the current flows through the wire, the other half continues through the bulb 3) all the current flows through the wire 4) none of the above ConcepTest 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: Short Circuit II 1) glow brighter than before 2) glow just the same as before 3) glow dimmer than before 4) go out completely 5) explode ConcepTest 7 Circuits I The lightbulbs in the circuit below 1) circuit 1 are identical with the same 2) circuit 2 resistance R. Which circuit produces more light? (brightness power) 3) both the same 4) it depends on R ConcepTest 8 Circuits II The three lightbulbs in the circuit all have 1) twice as much the same resistance of 1 W . By how 2) the same much is the brightness of bulb B greater 3) 1/2 as much or smaller than the brightness of bulb A? (brightness power) 4) 1/4 as much 5) 4 times as much A C B 10 V ConcepTest 9 More Circuits I What happens to the voltage 1) increase across the resistor R1 when the 2) decrease switch is closed? The voltage will: 3) stay the same R1 S R3 V R2