Transcript Basic Ohms Law

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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.
 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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Lesson 2: Solving for I
 In 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 I
 It 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.
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Lesson 4: Solving for R
 Using 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
Next
Lesson 5: Calculating R
 It 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
Lesson 6: Calculating V
 It 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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Question 1: Ohms Law Equation
Question:
Answer:
 Select the correct
 V = Volts, I = Resistance, R = Current
representations of volts,
current, and resistance.
 V = Volts, I = Current, R = Resistance
 V = Resistance, I = Volts, R = Current
 V = Current, I = Resistance, R = Volts
Question 2: Solving for I
Question:
 Select the correct formula for
to solve for I.
Answer:
 I=V÷R
 I=R÷V
 I=V×R
 I=V×V
Question 3: Calculating I
Question:
Answer:
 If V = 12 and R = 1, select the
 12 volts
correct value for I.
 12 amps
 1 amp
 6 ohms
Question 4: Solving for R
Question:
Answer:
 Select the correct formula for
 V=V÷R
to solve for R.
 R=I ÷V
 R=V ÷I
 R=V ×I
Question 5: Calculating R
Question:
Answer:
 If V = 12 and I = 4, select the
 12 volts
correct value for R.
 4 ohms
 3 ohms
 1 ohm
Question 6: Calculating V
Question:
Answer:
 If I = 6 and R = 1, select the
 2 amps
correct value for V.
 3 ohms
 4 volts
 6 volts
Question 1: Correct !
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Question 2: Correct !
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Question 3: Correct !
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Question 4: Correct !
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Question 5: Correct !
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Question 6: Correct !
 You have completed the Ohm’s law lesson.
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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 = Resistance
 I = Current which does not start with I, but is the only
one that does not match.
Retry
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
Question 3: Incorrect !
 I can be calculated using the formula I = V ÷ R.
Retry
Question 4: Incorrect !
 To solve for resistance use the formula: R = V ÷ I
Retry
Question 5: Incorrect !
 I can be calculated using the formula R = V ÷ I.
Retry
Question 6: Incorrect !
 V can be calculated using the formula V = I × R.
Retry
More Information: Ohm’s Law
 Ohm’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.
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