All categories

3 years ago

Which best describes a difference between electric current and static electricity

2 answers:

8 0

Static electricity is caused by the build up of charges on surfaces of objects while electric current is the constant flow of electrons along a conductor (the rate of flow of charge).

melomori [17]3 years ago

3 0

The question is missing its alternative. Here is the complete question.

Which best describes a difference between electric current and static electricity?

a. Electric current is continuous and static electricity is not continuous.

b. Static electricity is continuous and electric current is not continuous.

c. Electric current involves the movement of electrons, and stattic electricity involves the moment of protons.

d. Static electricity involves the movement of electrons and electric current involves the movement of protons.

Answer: a. Electric current is continuous and static electricity is not continuous.

Explanation: Electric current occurs when there is a flow of electrons (negative charges) in a circuit or conductor. The flow happens when there is a difference of potential between the ends of a circuit. The flow of electrons is non-stop so, electric current is continuous.

Static electricity is due to an imbalance of electric negative charges within or on an object's surface. This imbalance most likely happens by friction and consists of motionless isolated charges. For that reason, static electricity is not continuous.

You might be interested in

A satellite is in elliptical orbit with a period of 7.20 104 s about a planet of mass 7.00 1024 kg. At aphelion, at radius 5.1 1

soldi70 [24.7K]

Answer:

1.64x $10^{-4}$ rad/s

Explanation:

Given:

satellite is in elliptical orbit with a period T= 7.20 x $10^{4}$ s

Mass of planet m= 7.00x $10^{24}$ kg

Satellite's angular speed ωa- = 4.987 10-5 rad/s

At aphelion, at radius Ra= 5.1 x 10^7 m

Assuming torque is zero for this system, therefore, the conservation of angular momentum can be defines as

Lp = La

Ip ωp = Ia ωa--->eq(1)

Where,

'a' represents aphelion and 'p' represents perihelion

ω represents angular velocity

and I represents the rotational inertia

Since, I= 1/2 mR²

Here R is the radius at aphelion / perihelion

m = mass of planet

eq(1)=> ωp= Ia ωa/ Ip

ωp= (1/2 m Ra² ωa) / 1/2 m Rp²

ωp= (Ra/Rp)² ωa --->eq(2)

In order to find Rp, we use : 2a= Rp + Ra

where a represents semimajor axis

with the help of Kepler's third law for elliptical orbits

a= ∛(GmT²/4π²)

a= ∛ 6.67x $10^{-11}$ x 7.00x $10^{24}$ x (7.20 x $10^{4}$ )² / 4π²

a= 3.97 x $10^{7}$ m

2a= Rp + Ra

Rp= 2a-Ra

Rp= 2 x 3.97 x $10^{7}$ - 5.1x $10^{7}$

Rp= 2.84 x $10^{7}$ m

Substituting all the required values in eq 2, we have

ωp= (Ra/Rp)² ωa

ωp= (5.1x $10^{7}$ /2.84 x $10^{7}$ )² x 4.987 x $10^{-5$

ωp= 3.224 x 4.987 x $10^{-5$

ωp= 1.64x $10^{-4}$ rad/s

Therefore, angular speed at perihelion is 1.64x $10^{-4}$ rad/s

3 0

3 years ago

Is the Florida scrub a forest or grassland

PIT_PIT [208]

It is a forest. Hope this helps. Much luck

4 0

3 years ago

Na figura, um bloco de massa igual a 5Kg é abandonado em repouso em um plano inclinado. Supondo que os coeficientes de atrito es

Law Incorporation [45]

The figure mentioned on the question is in the attachment.

Answer: a) $P_{x}$ = - 38.35N

b) $F_{N}$ = 30.5 N

c) $F_{f}$ = 27.45 N

d) a = - 13.16 m/s²

Explanation: A block on an inclined plane has 3 forces acting on it:

Force due to gravity $F_{g}$ = m.g;
Normal Force due to the plane;
Force of Friction $F_{f}$ = µ.N;

Since the plane is inclined, Normal Force is equal the y-component of the force due to gravity and Force of friction and the x-component of the force due to gravity are opposite forces.

The second attachment ilustrate the forces acting on the block.

Calculating:

A) The magnitude of the x-component of Force due to gravity:

According to the second image:

$P_{x}$ = P.sinθ

$P_{x}$ = 5.9.8.sin(36.8)

$P_{x}$ = - 38.35 N

B) $F_{N}$ = $P_{y}$ = m.g.cosθ

$F_{N}$ = 5.9.8.cos(36.8)

$F_{N}$ = 30.5 N

C) $F_{f}$ = 0.9.30.5

$F_{f}$ = 27.45 N

D) For the acceleration, use Newton's Law: $F_{R}$ = m . a

If there is movement, it is only on x-axis, so the net force is:

$P_{x}$ - $F_{f}$ = m.a

- 38.35 - 27.45 = 5a

a = - 13.16 m/s²

The value of acceleration shows there is no movement on the x-axis due to the friction.

7 0

3 years ago

A net force of –8750N is used to stop of 1250.kg car travelling 25m/s. What braking distance is needed to bring the car to a hal

Karolina [17]

Answer:

d = 44.64 m

Explanation:

Given that,

Net force acting on the car, F = -8750 N

The mass of the car, m = 1250 kg

Initial speed of the car, u = 25 m/s

Final speed, v = 0 (it stops)

The formula for the net force is :

F = ma

a is acceleration of the car

$a=\dfrac{F}{m}\\\\a=\dfrac{-8750}{1250}\\\\a=-7\ m/s^2$

Let d be the breaking distance. It can be calculated using third equation of motion as :

$v^2-u^2=2ad\\\\d=\dfrac{v^2-u^2}{2a}\\\\d=\dfrac{0^2-(25)^2}{2\times (-7)}\\\\d=44.64\ m$

So, the required distance covered by the car is 44.64 m.

4 0

3 years ago

Earth Atmosfear is uniqe amongst the planets and is able to support life because it contains a large amount of __?

kiruha [24]

Answer:

Explanation:

The abundance of oxygen in our atmosphere and the presence of liquid water on the surface of our planet makes our "Pale Blue Dot" stand out in contrast to the other planets in the solar system — a unique and fragile home for life.

3 0

2 years ago