ELEC 2411 - Lab 1
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Feb 20, 2024
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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
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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.
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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.
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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.
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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
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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
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Related Documents
Related Questions
Please break this down for me as much as possible, im struggling to grasp kirchhoff's, thank you.
arrow_forward
Analyze the scale divisions and determine the experimental error for the measurements, and enter it along with its units into table 5.
Based on the value of the experimental error estimate the value of the "Volts" measurement
Round your estimate to the correct number of significant figures, and enter this value into table 5.
Below you are given the read-out from a voltmeter.
Table 5
Volts
Volts Error
Value
Value >
Units >
volts
volts
volts
4
6.
10
arrow_forward
3. The figure on the left below shows a schematic diagram of a battery. The voltage measured by
U1 is called the terminal voltage given R1 = 1 ohm. In the figure on the right below, the terminal
voltage of each of the battery-resistor combination is Vr = 1.5 volts. Find the following:
a. The current passing through R5.
b. The currents passing through R1 and R3
C. The voltage across R1.
d. The voltage of the battery EMF.
e. The percentage of voltage loss ot the battery due to the internal resistance R1.
The power dissipated by the internal resistance R1.
g. The power dissipated by R5 if R1 = R2 = R3 = R4 = 0.
h. The percentage of power dissipation loss due to the four resistors R1, R2, R3, and R4
f.
R1
R3
S10
R1
U1
1.500
EMF
EMF
R5
100
V1
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$10
EMF
R4
EMF
EMF
arrow_forward
1. Why resistance is an important property in the field of electronics and electricity?
2. When a resistance measuring device, such as the ohmeter, is not available, how would one go about determining the value of resistance in a particular electronic circuit or device?
3. What would be the impact on the resistance, current, and voltage if you put two or more resistors in series and in parallel?
arrow_forward
Please show all work and circle your answers. Thank you
arrow_forward
1) In the following circuit using Kirchhoff's find:
a) The current in each branch of the circuit.
b) Terminal voltage for each branch (state whether each battery is charging or
discharging).
R1
26
B1
14V
++
R2
29
B2
21V
R3
28
Note: All resistor
values are in Ohms
arrow_forward
Part II: The potential difference across different elements of a circuit resistance in series
1. Using the circuit shown below, set R1 and R2 as shown in the chart below. For each pair of
resistances in the chart below, record the drop in voltage, or potential, across R1 (Figure a), drop
in voltage, or potential, across R2 (Figure b), then record it across both resistors (Figure c).
R,
R,
E,
E,
R,
Figure a
Figure b
R,
E,
E,
R,
Figure c
them
Resistance Values, Voltage Drops, and Curfent Data Values
R,
(ohms) (ohms)
R2
V,
(volts)
4 1-716 V
1.47 V
V2
(volts)
0.268 V
V12
(volts)
| (amps)
26
1.984
1.978 V
65.6 MA
22
0.531 V
65.6 MA
18
1-978 V
12
0.920 V
L.182 V
0796 V
65.6 mA
1.980 V
1.981 V
14
16
1.062 V
65.6 mA
10
20
0.657V
1.325 V
24
1.985 V
65.7 mA
0- 398 V 1. 587 V
65.6 mA
please help
mewith Question
2 and 3
no calculation
needed just a faugafh combination from the voltage and current numbers for that combination. Can this be developed
2. From the data above, explore the relationship…
arrow_forward
Question:
A battery is charged from a constant dc source of 220 V through a chopper. The dc battery
is to be charged from its internal emf of 90 V to 122 v. The battery has an internal
resistance of 1 ohm for a constant charging current of 10 A. What is the range of duty
сycle?
Option 1:
0.55 to 0.7
Option 2:
0.2 to 0.4
Option 3:
0.45 to 0.6
Option 4:
0.3 to 0.5
arrow_forward
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