ELEC 2411 - Lab 1

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School

Durham College *

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Course

2205

Subject

Electrical Engineering

Date

Feb 20, 2024

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docx

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7

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ELEC 2411 Lab 1 – Resistor and Ohms law Objective: T he student should be able to: 1. Connect and read electrical meters. 2. Determine resistance of a resistor. 3. State the relationship between resistance, voltage and current. 4. Solve problems concerning electrical resistance, current, and voltage. Background: Ohm's law states that the voltage of a circuit is equal to the product of the current (amps) times the resistance (ohms): V = IR. Ammeters are connected in series with the circuit that is being tested. The voltage of electrical cells in series is the sum of their individual voltages. (Actually, there is some reduction of voltage due to internal resistance of the cells, but this will be disregarded for our experiment.) If you do not remember how to connect cells in series, ask the instructor. Important Tips. 1. Remember you must never read resistance on a live or connected circuit. 2. Always make sure you have the meter set to the correct setting before connecting. 3. In this case be sure the meter is set to read ohms Version 2023 1 | Page
ELEC 2411 Resistance Measurement 1- Pair up in teams of three and take a variable resistor board from the shelves. 2- Each group should take a multimeter from the cabinets. 3- Take a couple of each size of leads from the wall. 4- Set your multimeter to the Ohms scale and choose the right range-based on the resistor you are measuring. 5- Place two leads on the meter. One in the COM port and One in the V, Ohms, and continuity port. 6- Place the other side of the lead on the resistor board across any 5 Ohms resistor- R1 7- Record the value on the meter. Measurement #1 5 ohm 8- Now remove the leads and place it across the 10 Ohms resistor- R2. Version 2023 2 | Page
ELEC 2411 9- Record the value on the meter. Measurement #2 10 o or 9.9 ohm 10- Using the colour codes determine the resistance colours and verify this using the ohmmeter. Read the back of the resistor and determine the tolerance color. Fill in answers below. R1 black green gold R2 brown black gold 11- What is the tolerance range for each resistor? R1 5% 9.5 to 10.5 R2 5% 9.5 to 10.5 12- Does the resistor reading on the meter fall in the tolerance range? Y/N. yes 13- Now that the resistance of the 2 resistors has been verified you can use ohms law to calculate how much current will flow in each resistor. 14- How much current do you calculate will flow with a power source of 12V dc and 5 ohms of resistance. I=E/R 2.40 a 15- How much current do you calculate will flow with a power source of 12V dc and 10 ohms of resistance. Version 2023 3 | Page
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ELEC 2411 I=E/R 1.2 a 16- Calculate the Power for consumed by each resistor. Remember P=ExI P1 28.8 w P2 14.4 w Voltage measurement 1- Pair up in teams of three take a walk over to the workstations. 2- Each group should take a multimeter from the cabinets. 3- Take a couple of each size of leads from the wall. 4- Ensure that your workstation is off. 5- On the LOCK OUT MODULE interconnect the grounding ports between the power station, lock out module, circuit breaker, and the indicator lamp boards. Version 2023 4 | Page
ELEC 2411 6- Take one lead and connect it between L1 on the Lockout Module and the L1 on the Circuit Breaker Module. 7- Take another lead and connect it between the T1 of the circuit breaker Module and the port 1 on the indicator lamp. 8- Now take a long lead and connect it between the N port of the Lockout Module to port 2 of the indicator lamp. 9- Set your multimeter to AC Volt scale and choose the right range-based on the resistor you are measuring. 10- Place two leads on the meter. One in the COM port and One in the V, Ohms, and continuity port. 11- One the other side of the lead connect across port and port 2 on the indicator lamp board. 12- Ask your instructor to double check your work before going any further. 13- When the instructor gives the okay, turn on the power and record the voltage. Version 2023 5 | Page
ELEC 2411 V 122.4 14- If the lamp is 6 watts what is the calculated amperage using Ohms Law below A=0.0490 A Version 2023 6 | Page
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ELEC 2411 Version 2023 7 | Page