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2 years ago

1. 50 W and 100 W lamps are designed for the same voltage. Which lamp has the higher filament resistance and why?

Physics

1 answer:

KiRa [710]2 years ago

5 0

Answer:

Look below.

Explanation:

1.) The resistance of a light bulb filament is effected by both length and cross-sectional area. Thicker wires have less resistance. A 120-Watt bulb has a greater current and a smaller resistance. Thus, a 120-Watt bulb must have a thicker filament than a 60-Watt bulb (assuming the lengths of the filaments are identical). We also think of lightbulbs in terms of their power ratings in watts. Let us compare a 25-W bulb with a 60-W bulb. Since both operate on the same voltage, the 60-W bulb must draw more current to have a greater power rating. Thus the 60-W bulb’s resistance must be lower than that of a 25-W bulb. If we increase voltage, we also increase power. For example, when a 25-W bulb that is designed to operate on 120 V is connected to 240 V, it briefly glows very brightly and then burns out. Precisely how are voltage, current, and resistance related to electric power?

2.) Energy transferred = 120 × 2 = 240 J. This equation can be rearranged to V = E ÷ Q. So voltage is energy transferred divided by charge.

3.) Power= Voltage × Current

4.) W=Pt

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Suppose you are standing at the earth's geographic north magnetic pole, the place on the earth's surface that compasses point to

Brut [27]

Answer:

It would point up.

Explanation:

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3 years ago

Which is a way that biotechnology has not helped society

nata0808 [166]

I would select answer C

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3 years ago

At what distance from a 27 mw point source of electromagnetic waves is the electric field amplitude 0. 060 v/m ?

n200080 [17]

The distance from a 27 mw point source of electromagnetic waves where the electric field amplitude 0. 060 v/m will be 21.21 m .

Electromagnetic waves or EM waves are waves that are created as a result of vibrations between an electric field and a magnetic field. In other words, EM waves are composed of oscillating magnetic and electric fields.

The highest point of a wave is known as 'crest' , whereas the lowest point is known as 'trough'. Electromagnetic waves can be split into a range of frequencies. This is known as the electromagnetic spectrum.

c = 3 * $10^{8}$ m/s

∈ = 8.85 * $10^{- 12}$ $C^{2}$ / N/ $m^{2}$

E = 0. 060 v/m

I = P / 4π $r^{2}$

Also , I = c ∈ $E^{2}$ /2

$r^{2}$ = P / 4π I equation 1

substituting the value of I in equation 1

$r^{2}$ = 2 P / 4π (c ∈ $E^{2}$ )

$r^{2}$ = 2 * 27 * $10^{-3}$ / 4 * 3.14 * 3 * $10^{8}$ * 8.85 * $10^{- 12}$ * $(0.06)^{2}$

r = 21.21 m

To learn more about Electromagnetic waves here

brainly.com/question/12392559

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2 years ago

Sometimes you can see a faint reflection in the surface of a shiny plate or cup.Why ?

bazaltina [42]

Answer:

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3 years ago

You should ALWAYS carry the microscope by placing your hand on the base of the microscope and gripping the red handle with your

marin [14]

Answer:

true

Explanation:

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3 years ago