# Resistance

## I7-23: Magnetic Track and Superconductor

Purpose: To illustrate levitation of a superconductor and magnetic pinning

## K6-52: IMPEDANCE MATCHING - BATTERY AND JOULEMETER

Purpose: Demonstrate that the power transmission is maximized when the source impedance and the load impedance are equal.

## K6-35: VOLTAGE DIVIDER

Purpose: Show how a voltage divider can be used to produce any voltage up to the maximum of the source.

## K6-33: WHEATSTONE BRIDGE

Purpose: Demonstrate operation of a Wheatstone bridge.

## K6-32: POTENTIOMETER

Purpose: Find an unknown EMF using a voltage divider.

## K6-22: ENERGY CONVERSION - IMMERSION HEATER

Purpose: Demonstrate quantitatively the conversion of electrical energy into heat.

## K6-21: HEATING IN CURRENT-CARRYING WIRE

Purpose: Show the conversion of electrical energy into heat.

## K5-45: SEMICONDUCTOR MODEL

Purpose: Model of semiconductor.

## K5-44: NON-OHMIC DEVICE - LIGHT BULB

Purpose: Show the change in resistance of a light bulb with temperature.

## K5-41: V-I CURVES FOR OHMIC AND NON-OHMIC DEVICES

Purpose: Illustrate resistive properties of resistors and diodes.

## K5-34: THERMAL COEFFICIENT OF RESISTANCE IN COPPER

Purpose: Show that the resistance of copper changes linearly with temperature.

## K5-36: RESISTORS AT LN TEMPERATURE - LIGHT BULB INDICATOR

Purpose: Demonstrate materials with both positive and negative temperature coefficients of resistance.

## K5-32: RESISTANCE VS DIAMETER AND LENGTH

Purpose: Determine how resistance varies as a function of diameter and length for the same material.

## K5-35: RESISTORS AT LN TEMPERATURE

Purpose: Illustrate materials with both positive and negative temperature coefficients of resistivity.

## K5-13: ELECTRIC CURRENT - MODEL

Purpose: Indicate how electrons really flow through a conductor.

## J7-12: CURIE POINT OF IRON

Purpose: Show the Curie point of iron.

## I7-21: SUPERCONDUCTOR - MAGNET LEVITATION

Purpose: Demonstrate levitation of a magnet above a high-temperature superconductor

## K5-43: NON-OHMIC DEVICE - V VS. I

Purpose: Demonstrates the non-linearity of the V vs I curve for a diode

## K5-33 CONDUCTIVITY OF SALT SOLUTION

Purpose: Shows that pure water is not conducting, but a solution of an electrolyte is conducting

## K5-31 OHM'S LAW

Purpose: Demonstrates relationship between current, voltage, and resistance
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