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Homework 1v3

# Homework 1v3 - EE40 Summer 2011 Homework 1 Neel Shah Due...

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EE40 Summer 2011 Neel Shah Homework 1 Due 6/29/2011 Problem 1. Voltage Source Resistance Let's say we have a 5 volt battery that we want to use to drive a motor. We first hook up an ideal ammeter to the (fully charged) battery to find out what its maximum current delivery can be. We get a reading of 8 amps. What is the source resistance of the battery? Next we hook up this battery to the motor, which requires 5 watts of power at 5 volts. Can this battery drive the motor? Why or why not? (Hint - model the motor as a resistor. What would its value be?) Problem 2. Wheatstone Bridge A strain gauge is a resistor whose resistance changes based on an applied force. We wish to measure this unknown resistance using a wheatstone bridge circuit, shown below. The circuit is powered by an ideal 10 volt battery and an ideal voltmeter is placed in the middle of the circuit. The voltmeter output will change based on the unknown resistance.

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