Question

Why does the bulb of bicycle run with a dynamo glow brightly when speed of bicycle is increased and become dim when the speed is decrease?

Answer 1

1) Glowing of bulb depends on Power.....

2) P = V^2/R..... So P increases when V
increases....



When bicycle is run with a greater speed,
the dynamo's armature rotates with a greater speed.

So, the magnetic flux linked with coil changes fastly.....

Also, from Faraday's law of Electromagnetic Induction, V = - d(phi)/dt.....

Thus, V increases.....

As V increases, Power also increases, hence, the bulb glows brighter.....

Opposite happens when speed is slow....


Hope this helps

Answer 2

Answer:

The bulb glows brighter when the speed of the bicycle is increased because of Faraday's Law of Electromagnetic Induction. According to this law, voltage increases when the flux is increased. The greater speed increases the current which in turns results in an increase in magnetic flux.

Explanation:

The glowing of the bulb depends on the Power consumed, that is the energy used per unit time.

Power is given by the formula,

$P = \frac{V^{2} }{R}$

Power is directly proportional to resistance.

So P increases when V increases.

When the bicycle runs at a greater speed, the dynamo's armature rotates at a greater speed.

So, the magnetic flux linked with the coil changes fast.

Also, from Faraday's law of Electromagnetic Induction,

V = - d(Ф)/dt

Where Ф  is the magnetic flux.

Thus, V increases as the magnetic flux increase.

As V increases, Power also increases, hence, the bulb glows brighter.

The opposite happens when speed is slow.

Hence, the bulb of the bicycle runs with a dynamo glows brightly when the speed of the bicycle is increased and becomes dim when the speed is decreased.

To read more about Faraday's Law of Electromagnetic Induction, visit

https://brainly.in/question/10319372

https://brainly.in/question/14788875

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