Electricity test Flashcards
What does the term grounding mean?
Nutralizing or getting rid of charge on an object by getting it in contact with the ground
What is an Electroscope
A two peiced of tin and a negativily charged rod causing the two peices to seperate
What is a electrostatic series?
It is a list of materials that helps determine wether or not it will be gaining a posotive or negative charge.
What is static electricity?
electricity that does not move from the object
What is current electricity?
Electricity moving along a controlled path
What is an ammeter, how is it represented?
It is a device that measures the current in a circuit and is represented by an A in a diagram.
What is a Voltmeter and how is it represented in a circuit?
A voltmeter is a device that calculates the amount of voltage between two points in a circuit, it is represented by a V with two lines connecting to spesific places on the circuit diagram.
What are the nessesairy materials for a circuit?
Load
Switch
Connecters
Source
What is an insulator?
It is a material the electricity cannot pass through, ex. Rubber
What is a conductor?
It is a material that electricity can flow through freely
Which side of a cell do the electrons flow from?
The smaller line
What is an open circuit, what is a closed one?
An open circuit is a circuit that has a break in the pathway so everything freezes, a closed circuit has flowing electricity and the no breaks in the connectors.
What is charging by induction?
When a charged object is close but not touching a neutral object
What is chargeing by contact?
When a charged object touches a neutral object
What is the symbol and unit of measurment for current?
Current, Symbol = I , Unit of measurement = A (Amperes)
What is the symbol and unit of measurement for Voltage?
Voltage, Symbol = V , Unit of measurement = V (Volts)
What is the symbol and unit of measurement for Resistance?
Resistance , Symbol = R , Unit of measurement = Ω (Ohms)
What is the symbol and unit of measurement for energy?
Energy, Symbol = E , Unit of measurement = J (Joules)
What is the symbol and unit of measurment for power?
Power, Symbol = P, Unit of measurement = W (Watts)
What does the law of electric charges state?
Like charges repel, oposite charges attract, charged and neutral objects attract.
What are three methods for creating static charge?
Charging by friction (Two neutral objects are rubbed together, one gains one loses electrons)
Charging by Induction (A charged and neutral object is close but bot touching)
Charging by contact (When a charged object touches a neutral on and gains charge)
How is lightning developed?
The charges seperate and negative ones go towards the ground as positives come up and meet in a big flash.
What are the four factors that affect resistance?
Diameter
Length
Material
Temperature
How does multipule loads affect the current and voltage of a series circuit?
The current is same all the way through, The voltage is split between all the loads.
How does multipule loads affect the current and voltage of a paralell circuit?
The voltage is same throughout the circuit, the current is split within the branches
What is a fuse?
A fuse stops the flow of electricity when it becomes too much to handle.
How does a cell work?
In a cell a chemical reaction happens between electrodes and electrolyes that starts flowing electrons.
What is a dry cell?
What is a wet cell?
Dry cell = electrolytes in form of paste
Wet cell = electrolytes in form of liquide
What is DC and AC?
DC-Direct current is electrons that only travel in one direction
AC - Alternating current are electrons that can flow in both directions.
What is Ohms Law?
V=IR
How does Current, Voltage and Resistance change while more loads are added in a series circuit?
Current = IT= I1 = I2 = I3 Volts = VT = V1 + V2 + V3 Resistance = RT + R1 + R2 + R3
How does Current, Voltage and Resistance change while more loads are added in a Paralell circuit?
Current = IT = I1 + I2 + I3 Volts = VT = V1 = V2 = V3 Resistance = 1/RT = 1/R 1 = 1/R 2 = 1/R 3
