Electric Fundametals Flashcards
what is static electricity
build-up of a positive or negative charge on an object.
give me examples of static electricity
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.
describe the flow of electricity
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.
what is a conductor
A conductor is a material through which an electric charge is readily transferred
what is an insulator
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.
Give me methods of charging objects
Friction, induction ,contact
Give me methods of charging objects
Friction, induction ,contact
what is Potential Difference
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
what is conventional current
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.
what is electron current
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.
what is power
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).
what is power
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).
what is a triboelectric series
a listing of a variety of materials in order of their relative attraction for the electrons of another material.
Electrical Potential Energy
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
what is electrical potential difference
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
what are Series Circuits
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
in the series circuit what is the same everywhere
current
When light globes are connected in series, the more light globes in the series circuit the dimmer they get why is this so?
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
what are the rules for current in a parralell circuit
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
what is the rule for voltage in a parallel circuit
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.
rule for resistance in paralell circuits
Resistance - The total resistance of a parallel circuit is calculated using the formula:
1R= 1R1+1R2+1R3
….
what are complex circuits
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.
