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Section 2: Current
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Explain the relationship among voltage, current and resistance in a simple series circuit.
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I can explain Ohm’s Law. I can calculate voltage, current and
resistance using Ohm’s Law.
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Ohm’s Law explains the relationship between voltage (V or E), current (I) and resistance (R)
Used by electricians, automotive technicians, stereo installers, etc.
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It is the push or pressure behind current flow through a circuit, and is measured in (V) volts.
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Current refers to the quantity/volume of electrical flow. Measured in Amps (A)
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Resistance to the flow of the current. Measured in Ohms
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1. Assuming the resistance does not change:As voltage increases, current increases.As voltage decreases, current decreases.
2. Assuming the voltage does not change:As resistance increases, current decreases.As resistance decreases, current increases.
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V = I x R
I = V R
R = V I
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Battery voltage is 12V Current? Resistance 2 Ohm
VV
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Voltage is 12V Current is 4 Amps Resistance in Ohms ?
V
V
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Multi meters/ DVOM
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Why do we need resistors?
To decrease the amount of voltage applied to a component
The value of the resistor is marked on the body using colored rings.
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What is Voltage? What is Current? What is Resistance? Calculations on worksheet