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2 months ago

. A lightbulb with a resistance of 2.9 ohms is operated using a 1.5-volt battery. At what rate is

Physics

2 answers:

ValentinkaMS [3.4K]2 months ago

8 0

Answer:

Explanation:

Considering that,

A bulb has a resistance recorded at 2.9 ohms

R = 2.9 ohms

And applying a battery of 1.5V

V = 1.5 V

The objective is to calculate the rate of energy transformed

Initially, we must establish what is meant by the rate of energy

This concept refers to determining power, which is defined as the work done over time

P = Work done / time

So,

In electrical theory, the power dissipated across a resistor is expressed as

P = V² / R

P = 1.5² / 2.9

P = 0.7759 W

P ≈ 0.776 W

Thus, the electrical energy transformation rate in the light bulb is 0.776 Watts.

Sav [3.1K]2 months ago

7 0

Answer:

The rate at which the light bulb transforms electrical energy is 0.78 Joules per second.

Explanation:

The formula for electrical energy is given by,

E = IVt

The rate of electrical energy conversion in the light bulb can be expressed as;

$\frac{E}{t}$ = IV

According to Ohm's law, the current flowing through a conductor is directly proportional to the voltage across its terminals, assuming a constant temperature.

i.e V = IR

In this case: R = 2.9 Ohms and V = 1.5 Volts, hence the current can be calculated.

⇒ I = $\frac{V}{R}$

= $\frac{1.5}{2.9}$

= 0.5172

I = 0.52 A

Now;

$\frac{E}{t}$ = IV

= 0.52 × 1.5

= 0.78 J/s

Thus, the electrical energy conversion rate in the light bulb is 0.78 Joules per second.

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Answer:

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Provided Information:

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A very small round ball is located near a large solid sphere of uniform density. The force that the large sphere exerts on the b

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Respuesta:

Opción e

Explicación:

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Answer:

The correct option is 80 dB.

Explanation:

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[D] results in 100 dB

100 = 10 log (I/I₀)

Log (I/I₀) converts to 10

(I/I₀) = 10¹⁰

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I ∝ (1/d²)

I can be expressed as k/d²

When d = 1 m, the intensity is 10⁻² W/m²

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Providing that k = 0.01 W

For d = 20 m, we can calculate I

I = 0.01/20² = 2.5 × 10⁻⁵ W/m²

With four neighbors mowing their lawns concurrently,

I = 4 × 2.5 × 10⁻⁵ = 10⁻⁴ W/m⁻²

The sound intensity level in decibels is represented as

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Sav [3153]

The wavelength can be calculated as Planck's constant divided by the momentum of the ball.
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