The standard experiments on electricity and light.
3 lessons, about 2 h 25 min6 simulations10 problems7 practice questionsPython in every lesson
Created by StemPy LabOhm's law gives the resistance of a wire from the slope of a graph of voltage against current, and its resistivity follows from its length and diameter. The metre bridge compares two resistances through the lengths of a wire, . The potentiometer compares emfs and finds an internal resistance, , without drawing current at the balance point.
A galvanometer becomes an ammeter with a small shunt, , and a voltmeter with a large series resistor, . Its resistance is found by the half-deflection method, . A diode conducts well in one direction and badly in the other, and its characteristic is read from a table of voltage and current.
A convex lens gives from and by , and from the straight line of against . A glass slab gives its index from , and a prism from the least deviation, . Every one of these is found best from a graph or a mean of readings.
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