Phys 104 - BlackBoard Notes: Ohm's Law



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Ohm's Law
BlackBoard Notes

Pull connections by the "boot", not the wire!
Resistors, light bulbs: Which obey Ohm's Law?

Ohm's Law:

Ohm's Law

The circuit (draw with AC power supply, not DC batteries!):

Without meters: With meters:
Circuit diagram:

Meter settings (AC!!):

Voltmeter (digital)

700 volts

Ammeter (digital)

2 A {Resistors, incandescent bulb}

200 mA {Neon bulb}

Ammeter (analog)

1000 mA {Resistors}

250 mA {Incandescent bulb}

25 mA {Neon bulb}

Collect data up to 100 volts for the bulbs, 75 volts for resistors (Note to instructor: this only applies if the digital ammeter is used! This will keep the current through the resistors under 1A. When using the analog ammeter, the limits of the ammeter will restrict the voltage.)

Return to Setup

Voltmeter (digital)	700 volts
Ammeter (digital)	2 A {Resistors, incandescent bulb} 200 mA {Neon bulb}
Ammeter (analog)	1000 mA {Resistors} 250 mA {Incandescent bulb} 25 mA {Neon bulb}

Without meters:	With meters:


©	St. Lawrence University	Department of Physics