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3 years ago

12

We use electrical devices that produce motion, light, and sound. Which aspect of energy explains why these devices are possible?

2 answers:

matrenka [14]3 years ago

7 0

Answer:B

Explanation: If energy could be changed from one form to another we wouldn’t need different devices.

Lesechka [4]3 years ago

6 0

Answer:

B. Energy can change from one form to another.

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Complete Question

The complete question is shown on the first uploaded image

Answer:

a

$I(\tau)=0.051 A$

b

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c

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Explanation:

From the question we are told that

$I(t) = \frac{e}{R}(1-e^{\frac{t}{\tau} }) ; \ Where \ \tau = L/R$

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Substituting 12 V for $\epsilon$ and 150Ω for R

$I(\tau) = \frac{12}{150} (1- e^{-1})$

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From the question we are told to find $I(3 \tau)$ when t=0 equals the 3 times the time constant ( $\tau$ )

That is to obtain $I(3\tau)$ .This is mathematically represented as

$I(\tau = t) = \frac{\epsilon}{R} (1- e^{-\frac{3\tau}{\tau} })$

$I(\tau) = \frac{12}{150} (1- e^{-3})$

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$= \frac{12}{150}$

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