Question

How many times the polarity of a voltage will change if it has frequency 100 Hz ?​

Answer 1

Answer:

200 times.

Explanation:

We have frequency(f) as 100 Hz,

Then time period using relation  $\\\tt f= \dfrac{1}{T}$ gives,

T= $\dfrac{1}{100} s$ = 0.01 s

Which means one cycle (+ve and -ve halves) takes 0.01s to complete and the polarity changes twice per cycle.

Assuming you're asking how many times the polarity changes per second we have,

$\\\tt \dfrac{Total \ Time }{Time\ taken\ to\ complete\ one\ cycle} x ( polarity\ change \ per\ cycle)$

$\\\tt \dfrac{1s}{0.01s} x(2) = 200$

Therefore the polarity changes 200 times a second.