a) if a DMM is connected in series with a DC voltage source and another function other thanthe DC Current...

Series Resistive Circuits Name: TA: Class: BME3511-02 Date: September 30, 2014

Introduction:

This lab talk about a series circuit, which is a circuit that shows in which resistors are settled in a series, so only one trail the current has to take. The current is the same for each resistor. To find the total resistance of the circuit we simply add up the resistance of individually: R=R1+R2+R3.

Procedure:

We used three resistors (560Ω, 2200Ω, 6800Ω). To calculate the Nominal Values and DMM measurement, also we calculated the equivalent resistance for all the resistors to see if they were located in series with one another. Moreover, we calculate the series current with voltage 12VDC by using this equation: . Using breadboard to create a series circuit with the three resistors and no voltage source connected. We confirm the resistive value by measuring across each resistor, also confirm the equivalent resistance value by measuring across the three series resistors. Then, connecting the DC power supply in series with the resistors to measure the voltage across each resistor and the voltage across the three resistors in series by using the output voltage of 12 VDC and record our readings as showing below (in the result section). At the end, we connect the DMM in series with the resistors and selected the DC current in range of 20mA by using only the DC current. Turning off the DC power and connect the DC power in series with the resistors and the DMM then, turn the power on with output voltage of 12 VDC. Finally we turned off the power supply and disconnect it from our circuit.

Result:

	Nominal Value	DMM Measurement		Claculated Value	DMM Measurement
R1	220	217 Ohms	VR1	.286V	.28 VDC
R2	2200	2180 Ohms	VR2	2.86 V	2.83 VDC
R3	6800	6780 Ohms	VR3	8.85V	8.82 VDC
Req	9220	9170 Ohms	VReq	12VDC	11.93 VDC
Calculate series current(12VDC) = 1.3mA	Measured series current(12VDC)= 1 mA

Calculated Series current =

R= (12/9220) = .00130~1.3mA

Measured Series Current =

R= (12/12) = 1~1mA

Discussion:

The maximum allowable Dc current by using the DMM model 72-7940 DC current function is 200mA, and the maximum AC current is 2000mA.