2. Create this circuit, with the switch open and with spool #1 as the resistor. The BK multimeter will be the ammeter, with its dial set to 20A A_ _ _ , and the 20A and COM ports used by the wires. The Extech multimeter will be the voltmeter, with the dial set to 2V_ _ _ , and the COM and V ports used by the wires. 3. For resistance #1, write down the length of the wire and the diameter of the wire on the data sheet. Close the switch, read the voltage in volts and the current in amperes, and open the switch. 4. Calculate the resistance of the spool, from Ohm’s law. Calculate the resistivity of the material making up the wire. Calculate the percent difference between your experimental value of the resistivity and the theoretical value. 5. Repeat steps 3 and 4 for the other six spools. 6. THE WHEATSTONE BRIDGE PURPOSE: To measure the resistance of a resistor by a null (zeroing) method. b INTRODUCTION: Rs I1 Rx G a d I2 RL c RR
2. Create this circuit, with the switch open and with spool #1 as the resistor. The BK multimeter will be the ammeter, with its dial set to 20A A_ _ _ , and the 20A and COM ports used by the wires. The Extech multimeter will be the voltmeter, with the dial set to 2V_ _ _ , and the COM and V ports used by the wires. 3. For resistance #1, write down the length of the wire and the diameter of the wire on the data sheet. Close the switch, read the voltage in volts and the current in amperes, and open the switch. 4. Calculate the resistance of the spool, from Ohm’s law. Calculate the resistivity of the material making up the wire. Calculate the percent difference between your experimental value of the resistivity and the theoretical value. 5. Repeat steps 3 and 4 for the other six spools. 6. THE WHEATSTONE BRIDGE PURPOSE: To measure the resistance of a resistor by a null (zeroing) method. b INTRODUCTION: Rs I1 Rx G a d I2 RL c RR
P38%20Lab%20Book.docx