All categories

3 years ago

What is the power of an electric with a current of 0.5 A and a voltage of 120 V ? The formula for power is P =IV

Physics

2 answers:

erica [24]3 years ago

8 0

Answer:

60 W

Explanation: I took the quiz

zaharov [31]3 years ago

7 0

Answer:

60Watts

Explanation:

Given parameters:

Current = 0.5A

Voltage = 120V

Unknown

Power = ?

Solution:

The power in the electric circuit is the product of current and voltage;

P = IV

Insert the given parameters and solve;

P = 0.5 x 120

P = 60Watts

You might be interested in

if a freely falling object were somehow equipped with a speedometer on a planet where the acceleration due to gravity is 20 m/s/

Pie

Answer: The speed reading would increase each second by 20m/s

Explanation:

Acceleration is the change in velocity per unit change in time.

Acceleration = velocity/time

∆v = a∆t

Given a = g = 20m/s/s (acceleration due to gravity)

∆t = 1 sec

∆v = 20m/s/s × 1s

∆v = 20m/s

Therefore, the speed reading would increase each second by 20m/s

3 0

4 years ago

The tallest sequoia sempervirens tree in California’s redwood national parks is 111 m tall. Suppose an object is thrown downward

ch4aika [34]

The object's <u>initial velocity</u> is equal to $-10.59\frac{m}{s}$

Why?

From the statement we know the height of the tree and the time it takes to reach the ground, so, if we need to calculate its initial velocity, we can use the following formula:

$y=y_o-v_{o}*t-\frac{1}{2}g*t^{2}$

Where,

y, is the final height (0 meters in this case)

yo, is the initial height (111 meters in this case)

t, is the time elapsed (3.8 seconds in this case)

vo, is the initial speed.

g, is the acceleration due to gravity (-9.81 m/s2)

Now, let's set the origin at the top of the tree, so, rewriting the formula, we have:

$y=y_o+v_{o}*t+\frac{1}{2}g*t^{2}$

So, isolating the initial velocity, we have:

$y=y_o+v_{o}*t+\frac{1}{2}g*t^{2}$

$y=y_o+v_{o}*t+\frac{1}{2}g*t^{2}\\\\v_{o}*t=y-y_o-\frac{1}{2}g*t^{2}\\\\v_{o}=\frac{y-y_o-\frac{1}{2}g*t^{2}}{t}$

Finally, substituting and calculating, we have:

$v_{o}=\frac{-111m-0-\frac{1}{2}(-9.8\frac{m}{s^{2}}) *(3.8s)^{2})}{3.8s}\\\\v_{o}=\frac{-111m-\frac{1}{2}(-9.8\frac{m}{s^{2}})*(14.44s^{2})}{3.8s}\\\\v_{o}=\frac{-111m-\frac{1}{2}(-141.51m)}{3.8s}=\frac{-111m+70.75m}{3.8s}\\\\v_{o}=\frac{-40.25m}{3.8s}=-10.59\frac{m}{s}$

Hence, we have that the <u>initial velocity</u> of the object is $-10.59\frac{m}{s}$

Have a nice day!

7 0

4 years ago

Calculate the activation energy, E a Ea , in kilojoules per mole for a reaction at 57.0 ∘ C 57.0 ∘C that has a rate constant of

Alecsey [184]

Explanation:

Below is an attachment containing the solution

3 0

3 years ago

What is going to happen to the volume of a gas that is put under MORE pressure while keeping the temperature constant?

Mrac [35]

Boyle's law states that in an ideal gas system, pressure and volume have an inverse relationship when the temperature remains constant. So B.

3 0

4 years ago

Read 2 more answers

A current 1A in the human body is extremely dangerous.

zmey [24]

a) Potential difference needed: 10,000 V

b) Because the potential difference in the house is maximum 230 V

Explanation:

The relationship between current, potential difference and resistance in a conductor is given by Ohm's law:

$V=RI$

where

V is the potential difference

R is the resistance

I is the current

The resistance of the human body is estimated to be as high as $100,000 \Omega$ for a dry body and as low as $1000 \Omega$ for a wet body: in this problem, we use a value in the middle,

$R=10,000 \Omega$

Therefore, the potential difference needed to produce a current of

$I=1 A$

$V=(10,000)(1)=10,000 V$

Here we want to estimate if it is likely or not to get injured by an electric current in a house.

The amount of current that can be fatal is $I=1 A$ . From part a), we saw that in order to produce this current through the human body, a potential difference of

$V=10,000 V$

is needed.

However, the electricity that reaches the houses and then is connected to the household appliances has a potential difference of

V = 230 V

This value is much lower than 10,000 V, therefore the electricity in the house is unlikely to cause injures to human body.

Learn more about potential difference:

brainly.com/question/4438943

brainly.com/question/10597501

brainly.com/question/12246020

#LearnwithBrainly

6 0

3 years ago