Question

**Problem 3:** Suppose you have a
pocket calculator that draws a current of 0.21 mA from its 1.05-V
battery. Calculate the effective resistance of the
pocket calculator, in kilohms.

R=_______

**Problem 4:** The diameter of a
specific copper wire is 8.11 mm, and has a resistivity of 1.72 ×
10^{-8} Ω⋅m. Find the resistance of a 1.2 km length of such
wire used for power transmission in Ω.

R=_______

Answer #1

1. Suppose you have a pocket calculator that draws a current of
0.17 mA from its 1.3-V battery. Calculate the effective resistance
of the pocket calculator, in kilohms.
2. The diameter of a specific copper wire is 8.203 mm, and has a
resistivity of 1.72 × 10-8 Ω⋅m. Find the resistance of a 0.75 km
length of such wire used for power transmission in Ω
3.Find the power dissipated (in W) in each of the following
extension cords: Part (a)...

Problem 9: The hydroelectric
generators at the Hoover Dam can produce a maximum current of 8.00
× 103 A at 250 kV.
Part (a) What is the maximum power output of
the generators, in watts?
Pmax=_____
Part (b) The water that powers the generators
enters and leaves the system at a low speed (thus we can neglect
its change of kinetic energy) and loses 160 m of altitude during
the process. What is the water flow required, in cubic meters...

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