24. Basics of Electricity

Question 1

What is the symbol for a current?

Answer 1

I

Question 2

What does I means in electicity?

Answer 2

I is the symbol for a current in the basics of electricity

Question 3

What is a current?

Answer 3

A current is the amount of charge that flows over time. A current is measured in amperes and it is symbolized as A, therefore, A is the SI unit of current.

Question 4

How can you calculate current?

Answer 4

You can calculate current by using I=q/time.

Question 5

For current to flow you need two things… what are those two things?

Answer 5

1. Power source
2. A loop from + to -

Question 6

What is the symbol for voltage?

Answer 6

V

Question 7

In the subject of basic electricity, what does V stands for?

Answer 7

Voltage

Question 8

What is voltage?

Answer 8

Voltage is the quantitative expression of the potential difference in charge between two points in an electrical field.

Question 9

What is the difference between a current and a voltage?

Answer 9

Imagining a waterfall, current is the amount of charge (water) that flows overtime; on the other hand, voltage is the potential difference in charge (water) between two points in an electrical field (distance from where the water falls downwards to the ground). Think of it almost like gravity. The higher gravity is the harder you hit the ground.

Question 10

What is the difference of resistivity and resistance?

Answer 10

As a charge moves through a conductor it encounters barriers (like the mass of an atom) which slows the flow of the current. (it’s like friction for electricity). Resistance is the resistivity multiplied to length of an object divided the area of an object (which is πr²). Resistivity is a component of resistance.

Question 11

What is the difference of the resistivity (p) within metals, semiconductors, and superconductors?

Answer 11

not yet edited.

Question 12

What is the equation for resistance?

Answer 12

R=pL/A

Question 13

What is Ohms Law?

Answer 13

When a potential difference (voltage) is applied across the ends of most metal conductor the current proportional to the applied voltage. Thus, V=IR.

Question 14

What is an electrical power?

Answer 14

As current moves through a circuit, the electric energy can be transformed into other forms of energy.

The rate at which electrical energy is transformed to other forms is power.

Question 15

Explain the P=IV is the substitute Ohm’s Law in (V=IR) and you get two forms of “P.” What are those?

Answer 15

P = I²R and P = V²/R

Question 16

When energy is transformed within the concept of electrical power, two equations are forged, what are those?

Answer 16

P = ΔE/time or E = Pt