Lab-8 (LK) Parallel Circuit (3) Light Bulbs and Sockets Transistor socket 3.30 Resistor Potentiometer Objective Iran core) 1. Learn to build up a parallel circuit with three resistors and one DC source. KIT NO LC 2. Measure current passing through each resistor, and measure the voltage across each resistor. Pushbutton switch Coil 3. Verify the equations of parallel circuits. Equipment LA2 LCZ Component 1 1 EM-8656 AD/DC Electronics Lab spring 2 PS-3211 Wireless voltage sensor Battery Holder 3 PS-3212 Wireless current sensor B3 P1 P2 4 SE-8829 Student Multimeter B2 2 Batteries 53 54 Wires and Resistors R1 CI Banana R Jacks 33 0 100 0 320 0 Theory 58 The relations for three resistors in a parallel circuits are the following: PASCO scientific EM-86% ACIDC ELECTRONICS LABORATORY R 1 1 1 Figure 2: definition of the names of each spring connector RP RI R2 R; (1) 1=h+h2 + /3 (2) DR a Procedure A: Build a circuit as shown in Figure 1 using Pasco AD/DC Electronics Lab. AV = AV1 = 4V2 = AV3 (3 ) AV 1. Check Battery and put two batteries into the Battery Holder. Use multimeter to check the values of Rp: Equivalent resistance of the circuit. Figure 1 each battery [Battery-1 across B1 and B2; and Battery-2 across B3 and B4). The value of each battery should close to 1.5V. B2 wire connect to B3 (two batteries connected together), and record the DC voltage between B1 and B4 in the Table. Procedures A. Build a parallel circuit as shown in Figure 1 using Pasco AD/DC Electronics Lab. 2. Build a series circuit: B. Capstone Software and checking the circuit connection. 2.01 B4 wire connects to J4 2.02 B1 wire connects to J8 C. Data collection and calculations 2.03 C4 wire connects to C3 C2 CA 2.04 C3 wire connects to C2 Using Pasco AD/DC Electronics Lab to build circuits: 2.05 C2 wire connects to C1 R R 2.06 $3 R, connects to $7 R The names of each spring connector in the circuit board are shown in Figure 2. In the 2.07 $2 R2 connects to $6 rectangular areas of Figure 2, the springs are connected in pairs, oriented perpendicular to each other 2.08 $1 R, connects to $5 cs and named C and S. In a given rectangular area, the two springs should be treated equally in circuit ST 2.09 C5 wire connects to C8 connection. For example, connecting to C1 means connecting to $1 also. Therefore the names CI and $1 are interchangeable in the following circuit build procedures. Similarly for C2 and $2. 2.10 Co wire connects to C8 2.11 C7 wire connects to C8 Figure 3: Circuit connections on the circuit BoardProcedure B: Checking the series circuit connection, and Capstone Software setup 2. Data collection (for R,) Check whether the total number of wires and resistors in your circuit is 11 (the wire between B2 and 2.1 Remove the current sensor and the voltage sensor from the circuit. B3 does not count). If it is not, please check procedure A2. 2.2 Reconnect C4 and C3 by a wire. Use the multimeter's "voltage function" to measure the voltage across J4 and J8; record this value 2.3 Disconnect the wire between C7 and C8. [4V] in the table 2.4 Insert current sensor between $7 and $8, the sensor will give the current (1,) passing resistor R. 3 Disconnect C4 and C3 (remove the wire between C4 and C3). Use the multimeter's "resistance function" to measure the total resistance between $3 and $8; record this value (R,)) in the table. 2.5 Parallel connect voltage sensor across Ry (across $3 and $7), the sensor will give the voltage [AV,] across resistor R]. 4 Verify equation (1). If your data does not match equation (1), please check Procedure-A2 connections. Do not move to the next steps until the verification of equation (1) is passed 2.6 Open a new page on the Capstone, and open a table, name the "Table title" as "R1 data". 5 Insert current sensor between $4 and $3, the sensor will give the current (/) passing all the resistors Rp. 2.7 Click the 'RECORD' button. Wait about one second, click the button again to stop recording. Input the current and voltage average values in the data table. 6 Parallel connect the voltage sensor across $4 and $8, the sensor will give the voltage (AV] across 3. Data collection (for R2) all the resistors Rp- 3.1 Remove the current sensor and the voltage sensor from the circuit. 7 Capstone Software and Sensors: 3.2 Reconnect C7 and C8 by a wire. 7.1 Tum on the Capstone software. Press the power button on the wireless voltage sensor and wireless current sensor. The red LED should start blinking. The voltage/current sensor is now ready 3.3 Disconnect the wire between Co and C8. to connect via Bluetooth. 3.4 Insert current sensor between $6 and $8, the sensor will give the current (1,) passing resistor R2. 7.2 In the "Tools Palette" (on left side of screen) click on "Hardware Setup". This will open the 3.5 Parallel connect voltage sensor across Ry (across $2 and $6), the sensor will give the voltage hardware palette. Select the Bluetooth symbol. You should see the voltage/current sensor that (4V2) across resistor R2. is visible to Bluetooth to the computer. Select the sensor. Make sure its ID is the same as on the 3.6 Open a new page on the Capstone, and open a table, name the "Table title" as "R2 data". sensor. 3.7 Click the 'RECORD' button. Wait about one second, click the button again to stop recording. 7.3 Click "Hardware Setup" once again. This will close the hardware palette. Input the current and voltage average values in the data table. 7.4 As the hardware palette closes, the display palette opens up. Double click the "Table" on the 4. Data collection (for R3) up-right comer to open a table with two columns. On the left column of the table page, set the "Select Measurement" as current; and on the right column of the table page, set the 4.1 Remove the current sensor and the voltage sensor from the circuit. "Select Measurement" as voltage. 4.2 Reconnect Co and CB by a wire. 7.5 At the bottom-lower left of the screen is the 'RECORD' button. Once you click it, the system will 4.3 Disconnect the wire between CI and C2. start recording the current and voltage on the Table page. It will stop recording when clicked a second time. Click the "E" icon to get the current and voltage average (mean) values. 4.4 Insert current sensor between $2 and $1, the sensor will give the current (/;) passing resistor R3. 4.5 Parallel connect voltage sensor across Ra (across $1 and $5), the sensor will give the voltage Procedure C: Data collection and calculations (4V3) across resistor R3- 1. Data collection (for Ry) 4.6 Open a new page on the Capstone software, and open a table, name the "Table title" as "R3 data". 1.1 Procedure B step 5 and 6, click the "RECORD' button. Wait about one second, click the button 4.7 Click the 'RECORD' button. Wait about one second, click the button again to stop recording. again to stop recording- Input the current and voltage average values in the data table. 1.2 Input the current and voltage average values in the dato table. 5. Calculate the current passing through each resistor by using equation 1, 2, and 3, and enter in the 1.3 On the Capstone table page, enter the "Table title here" as "R-total data". Take a screenshot data table. of the Capstone data table, and submit it during the lab time. 6. Calculate the percent error between measured current and the calculated current values in the 1.4 Use your camera to take an image of your measurement setup. The image should show the step 5 for each resistor. voltage and current sensors, which have the Bluetooth ID. Submit the image during the lab 7. Verify equation 2 and 3. time.Data REPORT: Data Table DC Voltage Source (Voltage across B1 and B4] Voltage across J4 and JS Resistance [Q) R1 R2 R3 Measured equivalent resistant Rs [Q) RP Calculated equivalent resistant R (Q] form equation 1 RP Measured Current (A) Measured Voltage [V) AVI AV2 AV3 4V Calculated Current (V) (Using Equation 1, 2,3 ] Current % error Verify equation (2):1 = h +/2 + 13 Verify equation (3): AV = AV, = AV2 = 4V3