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Ohm’s Law

Ohm’s Law. Electric Currents. • Electric PE and Potential Difference • Electric Current and Resistance • Ohm’s Law, Ohmic vs. Nonohmic • Electric Circuits and EMF • Potential Divider Circuits and Sensors. How are Voltage, Current, and Resistance related?. V = I R. V. Potential Difference.

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Ohm’s Law

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  1. Ohm’s Law

  2. Electric Currents • Electric PE and Potential Difference • Electric Current and Resistance • Ohm’s Law, Ohmic vs. Nonohmic • Electric Circuits and EMF • Potential Divider Circuits and Sensors

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

  4. V R I How are Voltage, Current, and Resistance related? Slope = ∆y/∆x = ∆v/∆I V/I = R V = I R Slope = Resistance

  5. 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

  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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