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Chapter 17 Section 2: Current
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D4 Explain the relationship among voltage, current and resistance in a simple series circuit.
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Learning Target I can explain Ohm’s Law.
I can calculate voltage, current and resistance using Ohm’s Law.
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OHMS LAW
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What is Ohms Law? 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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VOLTAGE (V) It is the push or pressure behind current flow through a circuit, and is measured in (V) volts.
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CURRENT Current refers to the quantity/volume of electrical flow. Measured in Amps (A)
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RESISTANCE Resistance to the flow of the current. Measured in Ohms
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Chart
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General Rule. 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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How do we use Ohms Law?
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V = I x R I = V R R = V I
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How to calculate? Battery voltage is 12V Current? Resistance 2 Ohm V V
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How to calculate? V V Voltage is 12V Current is 4 Amps
Resistance in Ohms ? V V
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What can we use to measure?
Multi meters/ DVOM
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Resistors 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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Resistors
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Resistor color chart
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Learning Target Checkpoint
What is Voltage? What is Current? What is Resistance? Calculations on worksheet
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