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- 2. 07/25/2022 Temperature Variation of Resistance The resistivity of a metal depends on many (environmental) factors. The
- 3. 07/25/2022 For most metals, resistivity increases approx. linearly with temperature. ρ is the resistivity at temperature
- 4. 07/25/2022 Example: A resistance thermometer, which measures temperature by measuring the change in the resistance of
- 5. 07/25/2022 [Q] A resistance thermometer using a platinum wire is used to measure the temperature of
- 6. 07/25/2022 Superconductivity 1911: H. K. Onnes, who had figured out how to make liquid helium, used
- 7. 07/25/2022 Electrical energy and power In any circuit, battery is used to induce electrical current chemical
- 8. 07/25/2022 Electrical energy Consider circuit on the right in detail AB: charge gains electrical energy form
- 9. 07/25/2022 Power Compute rate of energy loss (power dissipated on the resistor) Use Ohm’s law Units
- 10. 07/25/2022 [Q] Calculate the total current drawn by all the devices in the circuit in the
- 11. 07/25/2022 Example A high-voltage transmission line with resistance of 0.31 Ω/km carries 1000A , starting at
- 12. 07/25/2022 (1) An aluminum wire carrying a current has a diameter 0.800 mm. The electric field
- 13. 07/25/2022 (5) Thermal energy is developed in a resistor at a rate of 100W when the
- 14. What is emf? A current is maintained in a closed circuit by a source of emf.
- 15. 07/25/2022
- 16. 07/25/2022 Each real battery has some internal resistance AB: potential increases by on the source of
- 17. 07/25/2022 Now add a load resistance R Since it is connected by a conducting wire to
- 18. 07/25/2022 Resistors in series 1. Because of the charge conservation, all charges going through the resistor
- 19. 07/25/2022 Analogous formula is true for any number of resistors, It follows that the equivalent resistance
- 20. 07/25/2022 example A B C I In the electrical circuit below, find voltage across the resistor
- 21. 07/25/2022 Resistors in parallel 1. Since both R1 and R2 are connected to the same battery,
- 22. 07/25/2022 Analogous formula is true for any number of resistors, It follows that the equivalent resistance
- 23. 07/25/2022 example In the electrical circuit below, find current through the resistor R1 in terms of
- 24. 07/25/2022 (11) (a) Find the equivalent resistance between points a and b in Figure 8.27. (b)
- 25. 07/25/2022 (a) Find the equivalent resistance between points a and b in Figure (b) If a
- 26. 07/25/2022 [Q] Determine the equivalent resistance between the terminals a and b for the network illustrated
- 27. 07/25/2022 Direct current circuits: example Find the currents I1 and I2 and the voltage Vx in
- 28. 07/25/2022 A battery with an emf of 12V and internal resistance of 0.9W is connected across
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