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July 5, 2015

Homework Help: Physics

Posted by Nina on Tuesday, February 10, 2009 at 1:08am.

A simple circuit is made of a power source, a rheostat and an ohmic resistor. The potential difference across the resistor is initially 5.0 +/- 0.1 V. A good lab student measures the current across the resistor to be 1.65 +/- 5 mA.

a)If the student increases the voltage across the resistor to 9.0 +/- 0.1 V, around what value should the measurement of the current across the resistor be (include uncertainties)?

b)what was the purpose of the rheostat in the circuit?

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