A. using an alternating current source
B. forward voltage drop
C. heavy load
D. using a Zener diode
Correct Answer: Option D
D. using a Zener diode
Explanation
The correct option is “Using a Zener diode” as fluctuation of d.c signal results from the rectification of a.c to d.c.
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![Five 80-W and three 100W are run for 8 hours. If the cost of energy is N5.00 per unit, calculate the cost of running the lamp. [1 unit = 1 kWh]](https://erudites.ng/wp-content/plugins/contextual-related-posts/default.png "Five 80-W and three 100W are run for 8 hours. If the cost of energy is N5.00 per unit, calculate the cost of running the lamp. [1 unit = 1 kWh]")