Question

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) An extension cord having a 0.055 Ω resistance and through which 5.00 A is flowing. A cheaper cord utilizing thinner wire and with a resistance of 0.28 Ω through which 5.00 A is flowing.

4. Suppose you have have a 1100 W toaster.Part (a) How much electrical energy in J is needed to make a slice of toast (cooking time = 1 minute)?
.Part (B) At 9.5 cents/kWh, how many cents does this cost?

Answer 1

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