Two scales on a nondigital voltmeter measure voltages up to 20.0 and 27.0 V, respectively. The...
Two scales on a nondigital voltmeter measure voltages up to 20.0 and 27.0 V, respectively. The resistance connected in series with the galvanometer is 1680 Ω for the 20.0-V scale and 2930 Ω for the 27.0-V scale. Determine the coil resistance.
Homework Answers
let the coil resistance is r
let the full scale current is I
for measuring 20 V
at full scale
20 = I *(1680 + r) ---(1)
for 27 V
27 = I*(2930 + r) ---(2)
from equation 1 and 2
27/20 =(2930 + r)/ (1680 + r)
solving for r
r = 1891.4 Ohm
the coil resistance is 1891.4 Ohm
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