lesson 1: ohm’s law equation
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Help. Lesson 1: Ohm’s Law Equation. The relationship between voltage, amperage, and resistance can be expressed in a simple equation. This equation is known as Ohm’s law. Ohm’s law is represented by the equation where volts = current × resistance. - PowerPoint PPT PresentationTRANSCRIPT
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Lesson 1: Ohm’s Law EquationThe relationship between voltage, amperage,
and resistance can be expressed in a simple equation. This equation is known as Ohm’s law.
Ohm’s law is represented by the equation where volts = current × resistance.
This equation often simplified into the expression V = I × R where V = Volts, I = Current, and R = Resistance.
Each quantity is expressed in units. V is expressed in volts. I is expressed in amps, and R is expressed in ohms.
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Information
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Lesson 2: Solving for IIn many situations the voltage is nearly
constant.Taking voltage (V) readings is easy because
these readings can be taken with the circuit energized and ready to use.
Using simple algebraic concepts Ohm’s law can be rearranged so we can solve for resistance (R) or current (I).
I can be calculated using the formula I = V ÷ R.
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Lesson 3: Calculating IIt is often practical to calculate I using Ohm’s
law.In order to calculate I, V and R must be
known.V is determined to be 12 volts using a
voltmeter.R is determined to be 3 ohms using an Ohm
meter.I can be calculated using the formula I = V ÷
R.Rewritten for this case the formula is I = 12
÷ 3.I is 4 amps.
Next
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Lesson 4: Solving for RUsing simple algebraic concepts Ohm’s law
can be rearranged so we can solve for resistance (R). This is another case of rearranging the formula for Ohm’s law using simple algebraic principals.
To solve for resistance use the formula: R = V ÷ I
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Lesson 5: Calculating RIt is often practical to calculate R using
Ohm’s law.In order to calculate R, V and I must be
known.V is determined to be 12 volts using a
voltmeter.I is determined to be 2 amps using an Ohm
meter.I can be calculated using the formula R = V ÷
I.Rewritten for this case the formula is R = 12
÷ 6.R is 2 ohms.
Next
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Lesson 6: Calculating VIt is possible to calculate V using Ohm’s law.In order to calculate V, R and I must be
known.R is determined to be 4 ohms using a
voltmeter.I is determined to be 3 amps using an Ohm
meter.V can be calculated using the formula V = I ×
R.Rewritten for this case the formula is V = 3 ÷
4.V is 12 volts.
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HelpLearn Each Lesson Answer Each QuestionRead each lesson.When you are done click
the next arrow to move on.
Press the help button if you need help.
Each question must be answered correctly to continue to the next lesson.
You will be given more information if you fail to answer each question correctly.
Back
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Question 1: Ohms Law EquationQuestion: Answer:Select the correct
representations of volts, current, and resistance.
V = Volts, I = Resistance, R = Current
V = Volts, I = Current, R = Resistance
V = Resistance, I = Volts, R = Current
V = Current, I = Resistance, R = Volts
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Question 2: Solving for IQuestion: Answer:Select the correct
formula for to solve for I. I = V ÷ R
I = R ÷ V
I = V × R
I = V × V
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Question 3: Calculating IQuestion: Answer:If V = 12 and R = 1,
select the correct value for I.
12 volts
12 amps
1 amp
6 ohms
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Question 4: Solving for RQuestion: Answer:Select the correct
formula for to solve for R.
V = V ÷ R
R = I ÷ V
R = V ÷ I
R = V × I
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Question 5: Calculating RQuestion: Answer:If V = 12 and I = 4,
select the correct value for R.
12 volts
4 ohms
3 ohms
1 ohm
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Question 6: Calculating VQuestion: Answer:If I = 6 and R = 1, select
the correct value for V. 2 amps
3 ohms
4 volts
6 volts
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Question 1: Correct !Please press the next arrow to continue
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Question 2: Correct !Please press the next arrow to continue
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Question 3: Correct !Please press the next arrow to continue
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Question 4: Correct !Please press the next arrow to continue
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Question 5: Correct !Please press the next arrow to continue
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Question 6: Correct !You have completed the Ohm’s law lesson.
Restart
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Question 1: Incorrect !This equation often simplified into the
expression V = I × R where V = Volts, I = Current, and R = Resistance.
Remember, V = Volts.R = ResistanceI = Current which does not start with I, but is
the only one that does not match.
Retry
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Question 2: Incorrect !Using simple algebraic concepts Ohm’s law
can be rearranged so we can solve for resistance (R) or current (I).
I can be calculated using the formula I = V ÷ R.
Retry
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Question 3: Incorrect !I can be calculated using the formula I = V ÷
R.
Retry
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Question 4: Incorrect !To solve for resistance use the formula: R = V
÷ I
Retry
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Question 5: Incorrect !I can be calculated using the formula R = V ÷
I.
Retry
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Question 6: Incorrect !V can be calculated using the formula V = I ×
R.
Retry
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More Information: Ohm’s LawOhm’s law is named after Georg Ohm. Georg Ohm was a scientist that performed
electrical experiments in the 1820s. Through hands-on tests and mathematical
calculations Georg discovered that power, voltage, resistance, and current are all related and dependant on each other.
For our purposes, Georg Ohm’s equation is simplified into the expression V = I × R where V = Volts, I = Current, and R = Resistance. Back