Download Resistance Review--Principles of Technology

Resistance Review--Principles of Technology
1. What does the thermal conductivity of a material depend on?
2. Thermal resistance is the opposition to the flow of what?
3. Thermal resistance is the ratio of what two things?
4. Dry friction depends on the force that presses two surfaces together and on what other
property?
5. In mechanical systems, how can you reduce friction?
6. Viscosity of most liquids _____________________ (increases, decreases) as
temperature increases.
7. Drag forces on a car moving through air can be reduced by
_______________________.
8. Kinetic friction between two surfaces is always ________ [greater, less] than static
friction between the same surfaces.
Series or Parallel Circuits?
9. the voltage drop across the lamps is the same, and equals the potential difference of
the power supply
10. more that one path for current
11. the current through each device and everywhere in the circuit is the same
12. 1/Rtotal = 1/R1 + 1/R2
13. the total current through the circuit is equal to the sum of the currents through all the
devices
14. one path for current
15. Rtotal = R1 + R2
16. the voltage drop across each device is the product of the lamp’s resistance and the
current.