Electrical Fundamentals

Question 1

What if multiple charges exist?

Answer 1

The force on any one charge equals the vector sum of the forces exerted on it by the other charges.

Question 2

Coulomb’s Law

Answer 2

The force between any 2 point charges is proportional to the product of the charges an inversely proportional to the square of the distance between them.

A force of attraction exists between unlike charges and a force of repulsion exists between like charges. = Coulomb’s Law

Question 3

Potential Energy

Answer 3

the energy of a body due to its state or position.

when charge flows from one point to another we say there is a potential (energy) difference between these 2 points.

Question 4

Kinetic Energy

Answer 4

the energy an object has because of its motion

Question 5

The (Electrical) Potentional Difference = Voltage

Answer 5

The … between two points is the work done in bringing a unit positive charge from one point to another. unit=volt.

Question 6

One Volt

Answer 6

is the potential difference between two points if the work done in bringing charge of one Coulomb from one point to the other is one Joule.

Question 7

The Electromotive Force (E.M.F)

Answer 7

on any closed loop is the work done in bringing unit positive charge around that loop.

In practical terms the EMF is the ‘driving’ or supply voltage.

Question 8

Electrical Current

Answer 8

is the rate of charge flow with respect to time

Question 9

One Ampere

Answer 9

one Coulomb per second.

Question 10

Electrical Power

Answer 10

is defined as the rate of energy expenditure . The units of power are Joules/sec or Watt (W).