+V1 SW1 R1 R2 100 Ω ли L1 10 V 9 ΚΩ 10 mH Figure 3: The Zombie Shocker Circuit 6.1. Hypothesis What do you think will happen when a zombie steps on the coil of wire and the switch is opened and why? Provide your answer in your lab report. You wait for the alpha to step onto the coil of wire and "open the switch". A large voltage spike drops the alpha and all of the zombies around it fall to the ground as well. You are safe for now. You gather your things and the people with you and run out one of the other doors. Once you are a safe distance away, you ask your friend how the zombie shocker actually worked. They tell you to figure it out yourself...
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The zombies showed up while you were sleeping! The zombie alarm you built goes off as they open the
door. You jolt awake to see an alpha-zombie charging through the door. The alphas are zombies that
turned all of the zombies in its army. If you can take down this one zombie, all the others pouring into
the room should fall as well. Luckily, your group was prepared for this eventuality. Another member of
your team has constructed the zombie shocker circuit shown in Figure 5, using some batteries for the
voltage source, some rusty metal for the resistors and a coil of wire for the inductor. The switch is just
you pulling apart two wires to open the circuit (while holding them by their insulated sheaths).
1. Construct the circuit shown in Figure 15 in the Circuit JS simulator.
2. Start the simulation with switch SW1 in the closed position. You’ve been charging this circuit all night,
so you’ll want to let the circuit run for a while (roughly 30 seconds at max simulation speed) to reach
true steady-state. You can speed this process up by changing the “simulation speed” slider in the top
right of the screen.
3. In a “Scope”, display voltage across L1:
3.1. Make sure to “Show Scale”, “Show Peak Value” and “Show Negative Peak Value” for the trace
(available under “gear” at bottom left of the scope window).
3.2. Suggest setting “time step” to 50 ns (available under “Options | Other Options…”).
4. Capture in the scope the inductor voltage when switch SW1 is opened. Include a screen shot.
5. Answer the following questions:
a) What is the largest negative voltage across the inductor?
b) How can it be this value when the DC supply is only 10 V?
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