Electric Fundametals

Question 1

what is static electricity

Answer 1

build-up of a positive or negative charge on an object.

Question 2

give me examples of static electricity

Answer 2

1.lightning
2.getting “zapped” by a car door.
3.charging a comb then 4.making your hair stand up
5.using a Van de Graaff Generator.

 

Question 3

describe the flow of electricity

Answer 3

Electrons can be taken from one object and transferred to another by friction. The object that loses electrons has a net positive charge. The object that gains electrons has a net negative charge.

Question 4

what is a conductor

Answer 4

A conductor is a material through which an electric charge is readily transferred

Question 5

what is an insulator

Answer 5

a material through which an electric charge is not readily transferred (no free moving electrons). Good insulators are glass, mica, hard rubber, sulfur, silk, dry air and many plastics.

Question 6

Give me methods of charging objects

Answer 6

Friction, induction ,contact

Question 7

Give me methods of charging objects

Answer 7

Friction, induction ,contact

Question 8

what is Potential Difference

Answer 8

The electrical potential difference between two points is measured in terms of the amount of work that has to be done to move a charge from one point to the other. Electrical potential difference is regularly referred to as just potential difference (p.d.) or more commonly as voltage

Question 9

what is conventional current

Answer 9

Defined as being in the direction of charge transfer. When we refer to the direction of current in a circuit we are referring to conventional current.

Question 10

what is electron current

Answer 10

Electrons flow from a region of higher potential to a region of lower potential, in other words, from negative to positive. Electron current is used to describe the actual movement of electrons.

Question 11

what is power

Answer 11

Power is the rate at which energy (work) is produced or used, therefore power is equal to the work done divided by the time taken. The unit for power is the watt (W).

Question 12

what is power

Answer 12

Power is the rate at which energy (work) is produced or used, therefore power is equal to the work done divided by the time taken. The unit for power is the watt (W).

Question 13

what is a triboelectric series

Answer 13

a listing of a variety of materials in order of their relative attraction for the electrons of another material.

Question 14

Electrical Potential Energy

Answer 14

The amount of potential energy a point has is related to the amount of charge it has. If two points have a different amount of charge, they have a different potential energy

Question 15

what is electrical potential difference

Answer 15

referred to as just potential difference (p.d.) or more commonly as voltage. The unit of electrical potential difference , volt (V) is obtained by comparing the amount of work done with the size of the charge that moves

Question 16

what are Series Circuits

Answer 16

components are connected one following another in a ring, the components are said to be in series with each other and the circuit is called a series circuit

Question 17

in the series circuit what is the same everywhere

Answer 17

current

Question 18

When light globes are connected in series, the more light globes in the series circuit the dimmer they get why is this so?

Answer 18

because the voltage is divided between them. If one light globe in a series circuit breaks or fails, all the others will go out with it. For this reason, light globes are always connected in parallel

Question 19

what are the rules for current in a parralell circuit

Answer 19

The current in a parallel circuit depends on the resistance of the branch. The total current flowing into the branches is equal to the total current flowing out of the branches. A1 = A5 Therefore the sum of the current in all of the branches equals the current flowing into the branches. A1 = A2 + A3 + A4

Question 20

what is the rule for voltage in a parallel circuit

Answer 20

Voltage - The voltage in a parallel circuit is the same for all branches and is the same as the supply voltage. V1 = V2 = V3 = Vsup.

Question 21

rule for resistance in paralell circuits

Answer 21

Resistance - The total resistance of a parallel circuit is calculated using the formula:

1R= 1R1+1R2+1R3
….

 

Question 22

what are complex circuits

Answer 22

Complex circuits consist of a combination of series and parallel connections. Most electrical devices are complex circuits. The rules for series and parallel circuits apply to complex circuits as well.