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Ohm ’ s Law

Ohm ’ s Law. How are Voltage, Current, and Resistance related?. V = I R. V = w / q. V. Potential Difference. Volts (V). I = ∆q / t. Current. Amps (A). I. R. Resistance. Ohms (Ω). R = pL/A. V. R. I. How are Voltage, Current, and Resistance related?. Slope = ∆y / ∆x.

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Ohm ’ s Law

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  1. Ohm’s Law

  2. How are Voltage, Current, and Resistance related? V = I R V = w/q V Potential Difference Volts (V) I = ∆q/t Current Amps (A) I R Resistance Ohms (Ω) R = pL/A

  3. V R I How are Voltage, Current, and Resistance related? Slope = ∆y/∆x = ∆v/∆I V/I = R V = I R Slope = Resistance OHMIC devices obey Ohm’s Law, and graph is linear

  4. Sample Problem If the current through a 20 Ω resistor is 2.5 A, what is the voltage across the resistor? • 20 V • 50 V • 70 V • 90 V

  5. Sample Problem If the current through a 30 Ω resistor is 2.0 A, what is the voltage across the resistor? • 30 V • 40 V • 50 V • 60 V

  6. Sample Problem If the voltage across a resistor is 30 V, and the current through the resistor is 6 A, what is the resistance of the resistor? • 180 Ω • 300 Ω • 5 Ω • 6 Ω

  7. Electric Power and Energy

  8. What is electric power? • Rate at which energy is used or converted How is it calculated? What are its units?

  9. What is electric energy ? • Total energy used or converted (work) How is it calculated? What are its units?

  10. How are power and energy related to each other? • (Is your electric bill for energy or power)? Energy = Pt Electric bill show kilowatt-hours (kwhrs) Therefore:

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