**# 1**

A standard flashlight battery can deliver about 1.4 W·h of energy before it runs down. **(a)** If a battery costs 80 cents, what is the cost in dollars of operating a 100 W lamp for 6.5 h using batteries? **(b)** What is the cost in dollars if power is provided at the rate of 6.0 cents per kilowatt-hour?

**#2**

When resistors 1 and 2 are connected in series, the equivalent resistance is 13.2 Ω. When they are connected in parallel, the equivalent resistance is 2.26 Ω. What are **(a)** the smaller resistance and **(b)** the larger resistance of these two resistors?

**#3**

In an *RC* series circuit, ε = 12.0 V, *R* = 1.35 MΩ, and *C* = 1.50 µF. **(a)** Calculate the time constant. **(b)** Find the maximum charge that will appear on the capacitor during charging. **(c)** How long does it take for the charge to build up to 6.80 µC?

**#4**

A capacitor with initial charge *q*_{0} is discharged through a resistor. What multiple of the time constant *τ* gives the time the capacitor takes to lose **(a)** the first 1/7-th of its charge and **(b)**6/7-th of its charge?

** **

Subject | Science |

Due By (Pacific Time) | 03/03/2014 07:00 am |

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