What is happening if energy input remains constant and voltage remains the same in a circuit, but the current decreases?
a. the resistance has increased.
b. the volts have decreased.
c. the power has increased.

A. The resistance has increased. Because here current is decreasing. Option C is incorrect cuz Power will decrease as resistance decreases according to equation P= v^2/R. V = volts, R = resistance. Hope it helps

I believe the correct answer from the choices listed above is option A. If energy input remains constant and voltage remains the same in a circuit, but the current decreases, then the resistance has increased. This relationship states that: The potential difference (voltage) across an ideal conductor is proportional to the current through it. The constant of proportionality is called the "resistance", R.

V = IR

So, I and R are inversely proportional. 

Hope this answers the question.

The correct option is this: the sound waves from the two trombones have slightly different frequencies.from the question given above, we are told that the loudness of the sounds were increasing and decreasing, this is because the frequencies of the two sounds are different. the means that the number of waves that pass a fixed point in a given amount of time differ for both sounds.