Electricity EOY Unit Quiz

Question 1

Polarization

Answer 1

Happens when electrons gather at one end, making that end more negatively charged. Protons stay at the opposite end, making that end more positively charged.

Question 2

Opposite charges

Answer 2

attract

Question 3

Like charges

Answer 3

repel

Question 4

Electric field

Answer 4

Region around a charged particle/object where the electric force is exerted ; allows charge to act at a distance. Field can move charges around. (push or pull force.)

Question 5

Static Charge

Answer 5

Static=not moving
A charged due to an object gaining or losing electrons. Creates imbalance in charge.

Question 6

Conductors

Answer 6

Material that allows electrons to flow easily. Readily conducts electric charge. metals like copper, skin

Question 7

Insulators

Answer 7

Materials that block flow of electrons through them. Plastic, glass, wood, air, rubber

Question 8

Conduction

Answer 8

Transfer of electrons through direct contact between objects.

Question 9

friction

Answer 9

Transfer of electrons through rubbing objects.

Question 10

induction

Answer 10

Transfer of electrons through an electric field working over a distance.

Question 11

Electric discharge

Answer 11

Process of unbalanced electric charge becoming balanced as electrons transfer from one object
ex; lightening

Question 12

Grounding

Answer 12

Providing electrons a safe way for going or flowing to the ground.

Question 13

Voltage

Answer 13

A difference in electrical potential energy causing electrons to flow in a circuit
-Charges travel from high EPE areas to lower EPE areas.
If there’s no voltage it’s still.

Question 14

Voltage source

Answer 14

Used to create voltage in a circuit.

Question 15

2 types of voltage source

Answer 15

BATTERY; converts chemical energy to electrical energy (voltage)
GENERATOR; converts mechanical energy to electrical energy (voltage)

Question 16

Voltage symbols etc

Answer 16

Quantity: voltage
Mathematical symbol: V
Unit: volts
Unit abbreviation: V

Question 17

Current

Answer 17

The number of electrons that pass a given point in a certain amount of time ( measures electrons speed)

Question 18

Current symbols etc

Answer 18

Quantity: current
Mathematical symbol: I
Unit: Ampere
Unit Abbreviation: A or Amp

Question 19

Resistance

Answer 19

Measure of the opposition to current flow in electrical circuit.
Slows the current down

Question 20

3 factors that effect resistance

Answer 20

Material of wire, thickness of wire, length of wire.

Question 21

Resistance symbols etc

Answer 21

Quantity: Resistance
Mathematical symbol: R
Unit: ohms
Unit abbreviation: omega symbol that looks like upside down horseshoe

Question 22

Ohms law

Answer 22

Amount of current through a conductor is directly proportional to the voltage in the circuit. Higher V = higher I
(VIR)

Question 23

Circuits

Answer 23

Complete circular path that electricity flows through (requires a voltage source)

Question 24

Open loop versus closed loop in a circuit

Answer 24

An open loop is a circuit that’s not connected so electrons are unable to flow through. A closed loop is connected so electrons can flow through.

Question 25

Series circuit

Answer 25

Components connected in a single path, so the same current flows thorough all of the components. -every device has to function for the circuit to be complete -total resistance is equal to all resistors added together. - the more resistors, the slower the current (brightness of bulbs are dimmed)

Question 26

Parallel Circuit

Answer 26

Circuit contains more than one path for current to travel through -all devices experience the same voltage as voltage source -each component is wired to the battery in a separate loop -all but one light could be burned out, and that last one will still funcion.

Question 27

2 ways to change magnetic field

Answer 27

1. move a magnet between a copper coil 2. move copper coils between magnets.

Question 28

Generator versus motor

Answer 28

generator converts mechanical to electrical energy. Motor does the opposite and converts electrical energy to mechanical energy. A motor needs a voltage source, and a generator is a voltage source.

Question 29

Gears

Answer 29

A rotational circular object used to transmit rotational power. Purpose=can manipulate the size of the gears to increase the rate of rotation.

Question 30

3 ingredients needed to create electric current in generator

Answer 30

Coil wire/ copper, movement, magnet