* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Physics A – Series, Parallel and Compound Circuits Lab Purpose
Josephson voltage standard wikipedia , lookup
Transistor–transistor logic wikipedia , lookup
Negative resistance wikipedia , lookup
Flexible electronics wikipedia , lookup
Index of electronics articles wikipedia , lookup
Immunity-aware programming wikipedia , lookup
Regenerative circuit wikipedia , lookup
Integrated circuit wikipedia , lookup
Valve audio amplifier technical specification wikipedia , lookup
Operational amplifier wikipedia , lookup
Schmitt trigger wikipedia , lookup
Electrical ballast wikipedia , lookup
Two-port network wikipedia , lookup
Power electronics wikipedia , lookup
Valve RF amplifier wikipedia , lookup
Surge protector wikipedia , lookup
Switched-mode power supply wikipedia , lookup
Power MOSFET wikipedia , lookup
Resistive opto-isolator wikipedia , lookup
Current mirror wikipedia , lookup
Opto-isolator wikipedia , lookup
RLC circuit wikipedia , lookup
Current source wikipedia , lookup
Physics A – Series, Parallel and Compound Circuits Lab Purpose: To investigate the properties of series and parallel circuits in terms of overall resistance and determine relationships between voltage drops and current flow in different sections of each circuit. Go to: http://phet.colorado.edu/simulations/sims.php?sim=Circuit_Construction_Kit_DC_Only And click on Run Now. Once the Java activity has loaded, use it to build and study the two circuits. Information on building the circuits: Start by clicking on an item and dragging it onto the screen. The red dotted circles represent points of connection and junctions for the circuit. Connect devices by placing the red dots on top of each other and they will connect. Wires can be stretched between two junctions once they are connected at one end. Each of the devices can be modified by right clicking on the item in the circuit and using the sub menu that appears. Right clicking on a connection will allow it to be disconnected. The Voltmeter works by touching each probe to a junction point on the circuit, the potential difference between the points will then be measured in volts with reference to high and low potential. A positive voltage reading shows the red probe being at highest potential while a negative reading means the black probe is at highest potential. Ammeters must be placed in the circuit in series to measure the flow of current. They will only measure the current that will flow through them according to their placement. There are two Ammeters available in the table to the right of the screen. One must be connected into the circuit in series and along the current path you want to measure. The Non-contact Ammeter will function by placing the cross-hair over the wire and giving the current. Remember, the program does not use conventional current. It depicts the actual motion of the negative charges around the circuit. Procedure: Part A: Series Circuit Circuit 1 1. Set up a series circuit using two resistors (a 10 Ohm and a 50 ohm and record in data table) and an ammeter to monitor the current leaving the source. Sketch a schematic of this circuit. 2. Set the source voltage between 15-20 V. 3. Measure the current that leaves the source and the voltage drop of the source. Record these values as the voltage and current of the source in the table below. 4. Use the Voltmeter to measure the voltage drop across each resistor. Record values in the data table. 5. Calculate the current flowing through each resistor. Record in data table for each resistor. (show work clearly below the table) 6. Calculate the equivalent resistance of the circuit (this is the total resistance that the source senses from the entire circuit) and record in the “Source” row. (show work clearly below the table) 7. Calculate the power dissipated by each resistor and the power output of the source. SERIES CIRCUIT Resistance (Ω) Current (A) Voltage (V) Power (W) Source R1 R2 Physics A – Series, Parallel and Compound Circuits Lab Circuit 2 8. Set up a series circuit using three resistors (a 10 Ohm, a 10 Ohm and a 50 ohm and record in data table) and an ammeter to monitor the current leaving the source. Sketch a schematic of this circuit. 9. Set the source voltage between 15-20 V. 10. Measure the current that leaves the source and the voltage drop of the source. Record these values as the voltage and current of the source in the table below. 11. Use the Voltmeter to measure the voltage drop across each resistor. Record values in the data table. 12. Calculate the current flowing through each resistor. Record in data table for each resistor. (show work clearly below the table) 13. Calculate the equivalent resistance of the circuit (this is the total resistance that the source senses from the entire circuit) and record in the “Source” row. (show work clearly below the table) 14. Calculate the power dissipated by each resistor and the power output of the source. SERIES CIRCUIT Resistance Current Voltage Power (Ω) (A) (V) (W) Source R1 R2 R3 Part B: Parallel Circuit: Circuit 1 1. Set up a parallel circuit using two resistors (a 10 Ohm and a 50 ohm and record in data table) and an ammeter to monitor the current leaving the source. The teacher must check your setup before plugging in the power supply. Sketch a schematic of this circuit. 2. Set the source voltage between 15-20V. 3. Repeat steps 3-7 from the series section. Resistance (Ω) PARALLEL CIRCUIT Current Voltage Power (A) (V) (W) Source R1 R2 Circuit 2 4. Set up a parallel circuit using the three resistors (a 10 Ohm, a 10 Ohm and a 50 ohm and record in data table) and an ammeter to monitor the current leaving the source. The teacher must check your setup before plugging in the power supply. Sketch a schematic of this circuit. 5. Set the source voltage between 15-20 V. Physics A – Series, Parallel and Compound Circuits Lab 6. Repeat steps 3-7 from the series section. PARALLEL CIRCUIT Resistance Current Voltage Power (W) (Ω) (A) (V) Source R1 R2 R3 Analysis Questions: Use full sentences and avoid the words “it” or “they” 1. For the series circuit, what is the sum of the voltage drops across the three resistors? Compare this to the voltage supplied by the power supply. Clearly state the relationship between the sum of all the voltage drops across the resistor and the Vsource. 2. For the series circuit, examine the calculated current flowing through each resistor. Clearly state the relationship between the current flowing through each resistor and the Isource. 3. For the series circuit, which resistor experiences the greatest voltage drop? If these resistors were light bulbs, would a large resistance bulb or a small resistance bulb be the brightest? Justify 4. For the series circuit, examine the equivalent resistance to the individual resistances used in the circuit. Clearly state the relationship between the Req and the individual resistances. 5. For the parallel circuit, examine the voltage drops across each of the three resistors? Compare this to the voltage supplied by the power supply. Clearly state the relationship between the voltage drops across each of the resistors and the Vsource. 6. Through which branch of the parallel circuit does the most current flow? If these resistors were light bulbs, would a large resistance bulb or a small resistance bulb be the brightest? Justify. 7. For the parallel circuit, examine the equivalent resistance to the individual resistances used in the circuit. Clearly state the relationship between the Req and the individual resistances. (a little harder to determine mathematical relationship- give it a try) 8. In the series circuit, examine the power output of the source with the power output of each resistor. Clearly state the relationship between Psource and the power output of the resistors. Does this relationship hold for parallel circuits as well? Try to justify your answer with a theoretical explanation based on a fundamental physics principle. Physics A – Series, Parallel and Compound Circuits Lab