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sashaice [31]
3 years ago
13

A device for increasing or decreasing voltage through electromagnetic induction.

Physics
1 answer:
yaroslaw [1]3 years ago
6 0

Answer:

O  Transformer

Explanation:

A transformer is a device for increasing or decreasing voltage through electromagnetic induction. It is very used in power transmission where alternating currents can be stepped up or down for house hold usage.

  • Electromagnetic induction is the process of generating current through magnetic fields.
  • It is made up of primary and secondary coils which helps to change voltage in the presence of magnetic filed at the core.
  • A transformer can either be a step up or step down device.
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6 0
3 years ago
Dee is on a swing in the playground. the chains are 2.5 m long, and the tension in each chain is 450 n when dee is 55 cm above t
Leno4ka [110]
Refer to the diagram shown below.

From the geometry, obtain
x = 2.5 - 0.55 = 1.95 m
cos θ = 1.95/2.5 = 0.78
θ = cos⁻¹ 0.78 = 38.74°

From the free body diagram, the tension in the chain is 450 N.
F is the centripetal force,
W is Dee's weight.

The components of the tension are
Horizontal component = 450 sin(38.74°) = 281.6 N, acting left.
Vertical component = 450 cos(38.74°) = 351.0 N, acting upward.

Answers:
Horizontal: 281.6, acting left.
Vertical: 351.0 N, acting upward.

8 0
4 years ago
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Eduardwww [97]

Answer:

A. Conservation of energy.

Explanation:

Kirchhoff's loop rule is an example of conservation of energy.

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