Homework 1 2012

Homework 1 2012 - EE 101 HW 1 EE Dept New Mexico Tech Fall...

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EE 101: HW 1 EE Dept., New Mexico Tech Fall 2012 Important Remarks Homework is due on August 31st, 2012 at the beginning of class Start early and get help if you need it Start a new page per problem Show all the work Specify all the units Circle your answers Staple pages Homework Problems: 1. Given the schematic shown in Figure 1 containing six circuit elements numbered U 1 through U 6 . The arrows represent the direction of assumed current flow through each element. The (+) and ( - ) signs label the voltage drops across each element. Ohms Law ( V = IR ) relates the voltage drop in the direction of assumed current flow for all the resistors in any circuit. Furthermore, the power delivered to any circuit element is defined by Watt’s Law ( P = IV ) where again V is the voltage drop in the direction of assumed current flow (use the Passive Sign Convention to be sure to get your signs right when calculating power) A negative value for P signifies that the element is delivering power. (a) Using Ohm’s Law and Watt’s Law, complete the table below. Be sure to show all calculations and label your units. (b) Sum the power values you obtained for elements U 2 through U 6 . Does this equal the value you calculated for the voltage source (with the opposite sign)? It should! Add them together, if they do not sum to zero then you have one or more errors in the table. As these values are related to each other, a mistake in one value could easily affect another. Check your work and check the power sum until you get it right. Your equation should look like this:

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