Lecture Demonstrations Laboratory

The Demonstrations Manual

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Electrostatics
Electric Fields And Potential
Capacitance
Current and Resistance
Electromotive Force And Current
DC Circuits: Ohm's Law; Resistivity of a Pencil; Resistive Heating of Nichrome Wire; Blowing a Fuse; Wheatstone Bridge; Wheatstone Bridge II; Circuit Analysis; RC Circuit; RC Time Constant (DECAY); Telephone model as simple DC circuit
Magnetic Materials
Magnetism
Inductance
Induction
Complex Circuits
Semiconductors And Tubes
Transmission Lines and Antennas

Ohm's Law

Purpose:

To show that v/I = constant = R.

Procedure:

Connect power supply to circuit. Vary the voltage to show that the voltage/current ratio is constant.

Hints:

Various modifications of the set up are available

Use a diode to demonstrate one way current flow with DC power supply.Current limiter might be required.

Connect a MOSFET transistor in series with a current limiting resistor (100 Ohms) with the Drain connected to the + and the Source to the ground. Simply touch the Gate of the MOSFET with your finger to create a tiny amount of excess charge on the Gate to have the current flow.

Comments:

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Equipment:

Connecting Wires
Hewlett Packard 0-12 V.D.C. power supply
Overhead Projection Circuit