# Phet electricity & magnetism lr lab

File Attached

#### AP-C

Electricity & Magnetism
Induction

### LR Lab

Name ____________________

Teacher __________________

Period  _____

Purpose

Materials  computer and internet

Background  Tipler Chapter 30-8

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

## Directions

1. Construct the circuit shown to the right.
2. What is the unit of the quotient of inductance and resistance?  Show your work below.
3. 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.
4. 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?
5. Add the necessary meters and sketch the graphs of i vs t, and VResistor 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 VResistor vs. Time VResistor vs. Time

1. Add the necessary meters and sketch the graphs of i vs t, and VInductor 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 VInductor vs. Time VInductor vs. Time

1. When is the brightness of the bulb increasing?

2. When is the brightness of the bulb decreasing?

3. When does the battery supply the potential to light the bulb?

4. When does the inductor supply the potential to light the bulb?

5. Does the direction of charge flow change through the inductor?  If yes, explain when.

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