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3 years ago

What does a resistor do in a circuit?

Physics

2 answers:

lara [203]3 years ago

5 0

lowers the amount of voltage going through a circuit

marin [14]3 years ago

5 0

If there is but one resistor in the circuit, it will limit the current flow according to E = I*R

If there are two resistors in series in the circuit, they will affect a voltage divider.

Though you haven't asked for it, the voltage drop across the 3 ohm resistor is E = I*R

I = 5 amps

R = 3 ohms

E = 5 * 3 = 15 Volts

And through the 2 ohm resistor, you get

I = 5 amps

R = 2 ohms

E = 2*5

E = 10 volts.

So the total is 10 v + 15 v = 25 volts

Each resistor then has a reading in voltage across it. That is called a voltage divider.

===========

One "resistor" like a light bulb is made to give light and also to limit the current.

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given the data 11.4, 11.3, 11.2 and 11.1 cm determine the average and its standard deviation using equation

Ostrovityanka [42]

Answer:

Average $\bar{x}$ = 11.25 cm

standard deviation = 0.129 cm

Explanation:

The data provided in the question is:

x₁ = 11.4 cm

x₂ = 11.3 cm

x₃ = 11.2 cm

x₄ = 11.1 cm

total number of data points, N = 4

Now, the average is calculated as:

Average $\bar{x}$ = $\frac{sum\ of\ all\ the\ data\ points }{number\ of\ data\ points}$

substituting the values in the above formula we get,

Average $\bar{x}$ = $\frac{11.4cm+11.3cm+11.2cm+11.1cm }{4}$

Average $\bar{x}$ = 11.25 cm

Now the standard deviation is calculated as:

standard deviation = $\sqrt\frac{\sum_{i=1}^{4} \left(x_i - \bar x \right )^2}{N-1}$

substituting the values in the above equation we get,

standard deviation = $\sqrt\frac{\left(11.4 - 11.25 \right )^2 + \left(11.3 - 11.25 \right )^2 + \left(11.2 - 11.25 \right )^2 + \left(11.1 - 11.25 \right )^2}{3}$

standard deviation = 0.129 cm

5 0

3 years ago

A train is traveling at a velocity of 90 m/s and it has to travel a distance of 2500 meters to reach the train station. How long

Vlada [557]

Answer:

27.7 or 28 seconds

Explanation:

2500/90=27.7

8 0

4 years ago

Calculate the force between two objects that have masses of 70 kilograms and 2,000 kilograms separated by a distance of 1 meter.

Makovka662 [10]

$▪▪▪▪▪▪▪▪▪▪▪▪▪ {\huge\mathfrak{Answer}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪$

The Gravitational Force between given objects will be ~

$9.34 \times {10}^{ - 6} \: \: N$

$\large \boxed{ \mathfrak{Step\:\: By\:\:Step\:\:Explanation}}$

We know that ~

$\huge\boxed{\mathrm{F = \dfrac{ Gm_1m_2}{ r²}}}$

where ~

F = gravitational force

$m_1$ = mass of 1st object = 70 kg

$m_2$ = mass of 2nd object = 2000 kg

G = gravitational constant = $6.674 × {10}^ {-11}$

r = distance between the objects = 1 m

Let's calculate the force ~

$F = \dfrac{6.674 \times 10 {}^{ - 11} \times 70 \times 2000 }{1 {}^{2} }$

$F =6.674 \times 7 \times 2 \times 10 { }^{ - 11} \times 10 {}^{4}$

$93.436 \times 10 {}^{ - 7}$

$9.3436 \times 10 {}^{ - 6} \: \: newtons$

6 0

3 years ago

A car travels 40 miles in 2 hours. If the car travels another 60 moles how long will it take to travel

Kisachek [45]

Answer:

<u><em>3 hours</em></u>

Explanation:

If the car takes 2 hours to go 40 miles, then the car can go 20 miles in 1 hour. Since the car is going 60 miles, it will take 3 hours.

Hope that makes sense :)

8 0

4 years ago

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Gunther needs a 75% concentrated solution. When making his solution at room temperature, he could only make a solution that was

jolli1 [7]

Answer:

Heat the solution, dissolve the solute, and let it cool verifying nothing settled out.

Explanation:

7 0

3 years ago

Read 2 more answers