Phet electricity & magnetism lr lab

File Attached

AP-C

Electricity & Magnetism
Induction

LR Lab

Name ____________________

Teacher __________________

Period _____

Purpose

Materials computer and internet

http://phet.colorado.edu/new/simulations/sims.php?sim=Circuit_Construction_Kit_ACDC

Background Tipler Chapter 30-8

Text Box: http://hyperphysics.phy-astr.gsu.edu/hbase/electric/induct.html#c1

Directions

Construct the circuit shown to the right.
What is the unit of the quotient of inductance and resistance? Show your work below.
The quotient of L and R is called the time constant. Adjust the time constant of the circuit to one second. Record the value of inductor and bulb’s resistance.
An inductor will be fully charged/discharged in a time of 4 to 5 L/R. How long will it take your LR combination to fully charge or discharge?
Add the necessary meters and sketch the graphs of i vs t, and V_Resistor vs t, on the graphs below when the inductor is charging and discharging.

Inductor is Charging		Inductor is Discharging
Current vs. Time		Current vs. Time

V_Resistor vs. Time		V_Resistor vs. Time

Add the necessary meters and sketch the graphs of i vs t, and V_Inductor vs t, on the graphs below when the inductor is charging and discharging.

Inductor is Charging		Inductor is Discharging
Current vs. Time		Current vs. Time

V_Inductor vs. Time		V_Inductor vs. Time

When is the brightness of the bulb increasing?
When is the brightness of the bulb decreasing?
When does the battery supply the potential to light the bulb?
When does the inductor supply the potential to light the bulb?
Does the direction of charge flow change through the inductor? If yes, explain when.

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