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ConcepTest 17.1a Electric Potential Energy I 1) proton A proton and an electron are in a constant electric field created by oppositely charged plates. You release the proton from the positive side and the electron from the negative side. Which feels the larger electric force? 2) electron 3) both feel the same force 4) neither – there is no force 5) they feel the same magnitude force but opposite direction electron electron - + E proton proton ConcepTest 17.1b Electric Potential Energy II A proton and an electron are in a constant electric field created by oppositely charged plates. You release the proton from the positive side and the electron from the negative side. Which has the larger acceleration? 1) proton 2) electron 3) both feel the same acceleration 4) neither – there is no acceleration 5) they feel the same magnitude acceleration but opposite direction electron electron - + E proton proton ConcepTest 17.1c Electric Potential Energy III 1) proton A proton and an electron are in a constant electric field created by oppositely charged plates. You release the proton from the positive side and the electron from the negative side. When it strikes the opposite plate, which one has more KE? 2) electron 3) both acquire the same KE 4) neither – there is no change of KE 5) they both acquire the same KE but with opposite signs electron electron - + E proton proton ConcepTest 17.6 Equipotential of Point Charge 1) A and C Which two points have the same potential? 2) B and E 3) B and D 4) C and E 5) no pair A C B E Q D ConcepTest 18.1 Which is the correct way to light the lightbulb with the Connect the Battery 4) all are correct 5) none are correct battery? 1) 2) 3) ConcepTest 18.2 Ohm’s Law across a certain conductor 1) Ohm’s law is obeyed since the current still increases when V increases and you observe the current 2) Ohm’s law is not obeyed increases three times. What 3) This has nothing to do with Ohm’s law You double the voltage can you conclude? ConcepTest 18.3a Wires I Two wires, A and B, are made of the 1) dA = 4 dB same metal and have equal length, 2) dA = 2 dB but the resistance of wire A is four times the resistance of wire B. How do their diameters compare? 3) dA = dB 4) dA = 1/2 dB 5) dA = 1/4 dB ConcepTest 18.3b Wires II A wire of resistance R is 1) it decreases by a factor 4 stretched uniformly (keeping its 2) it decreases by a factor 2 volume constant) until it is twice 3) it stays the same its original length. What happens 4) it increases by a factor 2 to the resistance? 5) it increases by a factor 4 ConcepTest 18.4 Dimmer 1) the power When you rotate the knob of a 2) the current light dimmer, what is being 3) the voltage changed in the electric circuit? 4) both (1) and (2) 5) both (2) and (3) ConcepTest 18.5a Lightbulbs Two lightbulbs operate at 120 V, but 1) the 25 W bulb one has a power rating of 25 W while 2) the 100 W bulb the other has a power rating of 100 W. 3) both have the same Which one has the greater 4) this has nothing to do with resistance resistance? ConcepTest 18.5b Two space heaters in your living room are operated at 120 V. Space Heaters I 1) heater 1 Heater 1 has twice the resistance 2) heater 2 of heater 2. Which one will give 3) both equally off more heat? ConcepTest 19.1a 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 19.1b 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 19.2a 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 19.2b Points P and Q are connected to a Parallel Resistors II 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 19.3a Current flows through a Short Circuit 1) all the current continues to flow through the bulb connected across the 2) half the current flows through the wire, the other half continues through the bulb bulb, what happens? 3) all the current flows through the wire lightbulb. If a wire is now 4) none of the above ConcepTest 19.3b 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 19.4a 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 19.4b The three lightbulbs in the circuit all have Circuits II 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 19.7 Junction Rule 1) 2 A What is the current in branch P? 2) 3 A 3) 5 A 4) 6 A 5) 10 A 5A P 8A 2A