* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Circuits Resistors
Lumped element model wikipedia , lookup
Index of electronics articles wikipedia , lookup
Regenerative circuit wikipedia , lookup
Galvanometer wikipedia , lookup
Negative resistance wikipedia , lookup
Josephson voltage standard wikipedia , lookup
Immunity-aware programming wikipedia , lookup
Valve RF amplifier wikipedia , lookup
Power electronics wikipedia , lookup
Schmitt trigger wikipedia , lookup
Operational amplifier wikipedia , lookup
Voltage regulator wikipedia , lookup
Two-port network wikipedia , lookup
Power MOSFET wikipedia , lookup
Switched-mode power supply wikipedia , lookup
RLC circuit wikipedia , lookup
Surge protector wikipedia , lookup
Electrical ballast wikipedia , lookup
Current source wikipedia , lookup
Current mirror wikipedia , lookup
Resistive opto-isolator wikipedia , lookup
Rectiverter wikipedia , lookup
Resistors Equipment • • • DMM and battery eliminator 56Ω resistor, light bulb and holder, appropriate cables Optional: Computer with voltage and current probes, hand generator Objective Physics Concepts • Ohm’s Observation, V=IR • Power, P=IV Experimental technique • Correctly connecting an ammeter (and voltmeter) in a circuit Experimental analysis • Fit curves to data to determine mathematical relationships • Recognizing the uncertainty in measurements Conceptual (C-Level) Draw a schematic wiring diagram for a circuit containing a DC voltage source (battery) and a resistive load (either a light bulb or resistor). • Show how to connect an ammeter and voltmeter to this circuit. • What happens if you connect a voltmeter and an ammeter incorrectly in your circuit? EXPLORATIONS: • Use the on-line circuit simulation to wire the simple circuit you just drew. Confirm current flows (light turns on). Explore other circuit configurations for different resistors etc. • Measure the resistance of the light bulb using the “Resistance/Ohm/Ω” setting on the DMM. Calculate the theoretical power used by the light bulb when operated at 3V. • Determine the resistance of the resistor (using color code and DMM). Calculate the theoretical power used by the resistor when operated at 3V. • Try connecting the voltmeter in series and observe any changes to your circuit. NOTE: Do not connect the ammeter incorrectly. NOTE: A voltmeter is connected in parallel with an object to measure the voltage drop across the object. An ideal voltmeter has infinite resistance. An ammeter is connected in series to measure the current through an object. An ideal ammeter has zero resistance. A fuse protects good ammeters from too much current. Your DMM can be configured to read either current or voltage. Basic Lab (B-Level) • • Graph the voltage as a function of current for a resistor and a light bulb. What does your data tell you? Please try to avoid burning out the light bulb! Explain any discrepancies with theory and note any observations. Advanced/Extended Lab Ideas (A-Level) • • • Measure the current and voltage as a function of time for a light bulb as it is turned on for the first few 100 milliseconds. This requires setting up a trigger for your data collection. Use a battery and measure the voltage and current as you decrease the resistance in a circuit. (This is hard to do for the battery eliminator) Explore something else that you are curious to investigate. Steve Lindaas © (2005) (2013) 1