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alisha [4.7K]
3 years ago
11

One major advantage of alternating current over direct current is that you can use alternating current with a device known as a

transformer. The reason why alternating current works in transformers but direct current does not is?
Physics
2 answers:
Oksanka [162]3 years ago
6 0

transformer makes use of mutual induction for its operation in which change in magnetic field in one coil due to variation of current , induces voltage in the other coil. so changing magnetic field in the primary coil is very much needed for the transformer. Alternating current is a current which varies with time , hence it is suitable to produce changing magnetic field in the primary coil. on the other hand , the direct current remains constant all the time. hence can not produce a changing magnetic field. so DC current is not useful for transformers.

marin [14]3 years ago
4 0

On USATestprep its D

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Which of the following is an example of an insulator?
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Answer:

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5 0
3 years ago
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A penny is dropped from the top of a tower. It hits the ground below after 2.5 s. How tall was the tower?
pychu [463]

Answer:

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H=ut+\frac{1}{2}gt^2

Where H is the height of the tower, t is the time taken to hit the ground, u is the initial velocity and g is the acceleration due to gravity.

Given that, t = 2.5 s, g =9.8 m/s², u = 0 m/s (at the top of tower)

H=ut+\frac{1}{2}gt^2\\\\H=0(2.5)+ \frac{1}{2}(9.8)(2.5)^2\\\\H=30.6\ m

3 0
3 years ago
A closed, uninsulated system fitted with movable piston, so no matter is exchanged with the surroundings, was assembled. Introdu
xeze [42]

Answer: You do not specify what is being asked for. ∆E? ∆H?

∆E = (430 - 238) J = 192 J

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Therefore ∆H = 430 J

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Therefore, ∆E = (430 - 238) J = 192 J

8 0
2 years ago
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