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