The rated voltage of lamp a is 220 V and the power is 100 W, and the rated voltage of lamp B is 220 V and the power is 25 W. after connecting them in series with 220 V, the voltage at both ends of lamp a is 0

The rated voltage of lamp a is 220 V and the power is 100 W, and the rated voltage of lamp B is 220 V and the power is 25 W. after connecting them in series with 220 V, the voltage at both ends of lamp a is 0

100w220 v = 0.455 a (current of a lamp), 220 V / 0.455 a = 483.5 ohm (resistance of a lamp)
25W / 220V = 0.114a, 220V / 0.114a = 1930 ohm
220V / (483.5 + 1930) = 0.09112.0.09112 * 483.5 = 44.1v (voltage at both ends of a lamp). 0.09112 * 1930 = 175.9v (voltage at both ends of B lamp)
Voltage * current = power. Voltage / current = resistance. Flexible use is enough

What is ln (1 / E) equal to

-1
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What is ln (- E) equal to?

Ln (- E) doesn't make sense because the true number in the logarithm is greater than 0