Question

Bathroom light circuit time time time time F: Zero at all times time

Your house mates are spending too long in the bathroom. To solve this problem, you design the bathroom light circuit in the diagram below. The light turns on when someone presses the lightswitch and then turns off a few minutes later, both conserving energy and discouraging people from spending too long in there!     (Note that when you press the lightswitch, the switch in the diagram moves from A to B or B to A, depending on where it started).

For the first 3 questions, assume that no one has been in the bathroom for a while, and then someone comes in and moves the switch from A to B

1. Which plot correctly describes the magnitude of the current through the bulb as a function of time after the switch moves from A to B?

2. Which plot in Q 1 correctly describes the magnitude of the charge on the capacitor as a function of time after the switch moves from A to B?

3. Explain what happens in the circuit, and why, when the switch moves from A to B.

4. Which plot in Q 1 correctly describes the magnitude of the current through the bulb as a function of time after the switch moves from B to A (when the next person uses the bathroom)?

5. Which plot in Q 1 correctly describes the magnitude of the charge on the capacitor as a function of time after the switch moves from B to A?

6. Explain what happens in the circuit, and why, when the switch moves from B to A (when the next person uses the bathroom).

7.

One of your housemates complains that the light turns off too quickly in the bathroom. What component(s) could you change in the circuit to increase the time that the light is on for and why would this work?

Question 7 options:

Answer 1

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