What causes resistance in an electrical current

Answers

Answer 1

Answer: An electric current flows when electrons move through a conductor, such as a metal wire. The moving electrons can collide with the ions in the metal. This makes it more difficult for the current to flow, and causes resistance.

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Gravity and friction are two kinds ofa.inertia
b.forces
c.masses
d.gravity

Answers

The answer is b, gravity and friction are forces.

Answer: B forces Hope this helps!!

Would you rather drink a hot beverage from a metal cup or a ceramic cup

Answers

Hey there!
I would personally drink a hot beverage from a ceramic cup than a metal cup for various reasons.
Firstly, ceramic cups do not change the taste of the beverage, while in some cases, metal cups do.

Secondly, since metal conducts heat, it would be wise to drink a hot beverage from a ceramic cup. Heated metal can burn your fingers if touched.

(If you feel that my answer has helped you, please consider rating it and giving it a thank you! Also, feel free to make the best answer, the brainliest answer!)

Thank you! :D

Ceramic, since metals can sometimes change the taste.

One example of a ______________ is the U-turn.

Answers

One example of a turnabout is the U turn

In a cathode ray tube, the number of electrons that reach the fluorescent screen is controlled by the A. cathode.
B. grid.
C. anode.
D. deflecting plate.

Answers

In a cathode ray tube, the number of electrons that reach the fluorescent screen is controlled by the grid. The correct option among all the options given in the question is option "B".When current issupplied to the heater, it causes the cathode to emit electrons. The electronspass through opening of the grid before reaching the anode. By controlling thenumber of electrons passing through the grid, the number of electrons reachingthe anode can also be controlled.

Answer: B. GRID

Explanation: I JUST TOOK THE PF EXAM AND GOT IT CORRECT!!!!

A particle with charge − 3.74 × 10 − 6 C is released at rest in a region of constant, uniform electric field. Assume that gravitational effects are negligible. At a time 8.36 s after it is released, the particle has a kinetic energy of 3.17 × 10 − 8 J. At what time t after the particle is released has it traveled through a potential difference of 0.401 V?

Answers

Answer:

57.5022228905 s

Explanation:

$V_i$ = Initial voltage

$V_f$ = Final voltage = 0.401 V

$t_1$ = Initial time = 8.36 s

$t_2$ = Final time

K = Kinetic Energy = $3.18* 10^(-8)\ J$

C = Charge = $3.74* 10^(-6)\ C$

Voltage is given by

$V=(K)/(C)\n\Rightarrow V=(3.17* 10^(-8))/(3.74* 10^(-6))\n\Rightarrow V=0.00847593582888\ V$

We have the relation

$(V_i)/(V_f)=((t_i)/(t_f))^2\n\Rightarrow t_f=\sqrt{(t_i^2V_f)/(V_i)}\n\Rightarrow t_f=\sqrt{(8.36^2* 0.401)/(0.00847593582888)}\n\Rightarrow t_f=57.5022228905\ s$

The time taken is 57.5022228905 s

Final answer:

To find the time after which the particle has traveled through a potential difference of 0.401 V, use the formula KE = q · V and solve for t.

Explanation:

To find the time after which the particle has traveled through a potential difference of 0.401 V, we need to use the relationship between kinetic energy, electric potential difference, and charge. The formula is given by:

KE = q · V

where KE is the kinetic energy, q is the charge, and V is the potential difference. Rearranging the formula, we have:

t = KE / (q · V)

Substituting the given values, we get:

t = (3.17 · 10-8) / ((-3.74 · 10-6) · 0.401)

Solving for t, we find that the particle has traveled through a potential difference of 0.401 V at a time of approximately 2.07 seconds.

Learn more about Electric potential difference here:

brainly.com/question/33395355

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What is speed of a particle?

Answers

The speed of a particle is the instantaneous rate at which its distance of travel
is changing.

Over any finite period of time, its speed is:

(distance traveled) / (time to travel the distance).

The direction of travel is irrelevant to a description of speed.

SPEED = total DIST. traveled / total time taken

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