Question 2 Questions 2 and 3 aim to help build your conceptual understanding of circuits. Educational research shows that many students leave high-school with conceptual misconceptions about how circuits work. These misconceptions are very hard to dislodge. The two worst misconceptions | see in this class are: Batteries are wrongly thought of as current sources. I guess people are thinking of them as pumps for current-so for example, if you have two in parallel they would pump twice as much current. But this is wrong! Batteries are voltage sources. They put out a constant voltage. How much current they put out depends on what they are connected to. It can be nothing (no closed circuit) or infinite (short circuit). What happens "downstream" in a circuit can't affect what happens upstream. For example, people don't realise that changing a resistance at the end of a circuit will affect the current at the start of a circuit. The best way to avoid these misconceptions is to slowly and methodically model the circuit, thinking hard about what all the currents and voltages are, and checking that your mental picture is self-consistent. Now-question 2: ID Let's check out one tricky point in modelling this circuit. Imagine the switch is open (i.e. no current can flow between 4 and 6). The potential (voltage) at location 6 is the same as the voltage at which other locations? Select all correct answers. Select one or more: Select one or more: O (1) O (2) O (3) 0 (4) 0 (5) O (7) O (8) 0 (9) O (10) O None of the numbered locations are at the same voltage as (6)With the switch still open, the current through bulbs A and B must be the same. What does this mean for the voltage at locations (3), (4) and (5)? Select one: Select one: O The voltage at locations (3), (4) and (5) is the same as the voltage at (10). O The voltage at locations (3), (4) and (5) is the same as the voltage at (1). O The voltage at locations (3), (4) and (5) is a bit lower than mid-way between the voltage at (1) and (10). O The voltage at locations (3), (4) and (5) is mid-way between the voltage at (1) and (10). The voltage at locations (3), (4) and (5) is a bit larger than mid-way between the voltage at (1) and (10). Check Now let's close the switch. The current at (3) will now split in two, with half going through bulb C and the other half going through bulb B. This means that the current through B is only half the current through A. How then must the voltage drop across bulb (A) compare to the voltage drop across bulb (B)? Select one: Select one: O The voltage drop across bulb A is twice the voltage drop across bulb B. O The voltage drop across bulb A is the same as the voltage drop across bulb B. O The voltage drop across bulb A is half the voltage drop across bulb B.If the battery puts out a voltage V, then when the switch is open, we've seen that the voltage drop across bulb A is V/2, and the voltage drop across bulb B is also V/2. But with the switch closed, we've seen that the voltage drops are no longer the same. So what does this mean for the brightness of bulb A and B when the switch is closed? Select one: Select one: O A stays the same and B gets fainter O A gets fainter and B remains the same A and B get fainter O A gets brighter and B gets fainter