EECE 263

Fall 2013

Practice Problems #1

1) The following plot represents the charge flowing through a wire into a battery. Sketch the corresponding current.

2) The following plot represents the current flowing through a wire into a battery. Calculate the corresponding charge.

3) A battery delivers 100 mA for about 10 hours. (a) How much charge was released? (b) If the voltage across the terminal is 1.3 V, how much power is the battery able to deliver? How much energy did it deliver?

4) The figure below shows the current through, and the voltage across, an electronic device. a) Sketch the instantaneous power consumption of the device b) Calculate the total energy consumed by the device.

5) A battery is charged with a constant-current charger of 1 mA. How long does it take to transfer 50 C if the battery is initially fully discharged.

6) The instantaneous power consumption of an air conditioning system is shown in the figure below. Calculate a) the energy consumption in Wh (Wattshour) and b) the average power consumption.

7) The charge in batteries is usually expressed in mAh (milliAmphour) a) Calculate how many mAh corresponds to 1 C

8) An alkaline AA battery can store 2100 mAh and has a terminal voltage of 1.5 V. Calculate how much charge the battery stores and how much energy it can deliver.

9) For the circuits below, find (i) the voltages across each device, (ii) the current through each device (iii) the power consumed/delivered by each device.

10) For the circuits below, find (i) the voltages across each device, (ii) the current through each device (iii) the power consumed/delivered by each device. Note: The source represented by a circle with an arrow insider is a constant current source, this device maintains a given current regardless of the resistance connected to its terminals (in this case, 1 A).

11) Find the equivalent resistance at the terminals a-b for each of the following networks.

12) Determine the equivalent resistance of the following circuit and the total current if vab=1 V: