Electricity

Question 1

Come from protons which are positive and electrons which are negative

Answer 1

Electric charges

Question 2

the accumulation of excess electric charges on an object

Answer 2

Static electricity

Question 3

electric charges can be transferred from object to object, but it cannot be created or destroyed

Answer 3

Law of Conservation of Charge

Question 4

+ -

Answer 4

Opposite charges attract

Question 5

+ +

- -

Answer 5

Like charges repel

Question 6

materials in which electrons move easily. Ex: metals

Answer 6

Conductors

Question 7

material in which electrons are not able to move easily. Ex: wood, plastic, rubber

Answer 7

Insulators

Question 8

process of transferring charge by touching or rubbing

Answer 8

Charging by contact

Question 9

rearrangement of electrons on a neutral object caused by nearby charged objects.

Answer 9

Charging by induction

Question 10

the net movement of electric charges in a single direction through a wire or conductor.

Answer 10

Electric current

Question 11

force that causes electric charges to flow; charges flow from the high voltage to the low voltage.

Answer 11

Voltage

Question 12

A closed path that electric current follows

Answer 12

Circuit

Question 13

Current always flows from negative to positive in a DC current

Answer 13

Direction of current flow in circuit powered by battery

Question 14

chemical reactions occur in a moist paste causing transfer of electrons.
Ex: the battery in the above diagram.

Answer 14

Dry cell

Question 15

contains two connected plates made of different metals in conducting solution.
Ex: car battery

Answer 15

Wet-cell

Question 16

tendency for a material to oppose the flow of electrons, changing electrical energy into thermal and light energy
- ex: Making wires thinner, longer or hotter increases resistance
All materials have some electrical resistance, which is measure in ohms ()

Answer 16

Resistance

Question 17

current in a circuit equals voltage difference divided by resistance

Answer 17

Ohm’s Law

Question 18

Small piece of metal that bends when it gets hot, opening the circuit and stopping the current flow

Answer 18

Circuit breaker

Question 19

a temporary magnet made by wrapping a wire coil carrying a current around an iron core. You can increase the strength of the magnetic field by adding more turns to the wire coil (solenoid) or increasing the current passing through the wire.

Answer 19

Electromagnets

Question 20

a device that changes electrical energy into mechanical energy.
In a simple electric motor, an electromagnet rotates between the poles of a permanent magnet

Answer 20

Electric Motor

Question 21

current that flows in only one directions through a wire. Ex. A battery

Answer 21

Direct current (DC) current

Question 22

reverses the direction of the current flow in regular patterns. Ex. Plugging toaster into the wall outlet

Answer 22

Alternating current (AC)

Question 23

Current has only one loop to flow through. Examples include:
Flashlight, holiday lights

Answer 23

Series Circuit

Question 24

Contains two or more branches for current to flow through. Examples include:
Homes, automobiles

Answer 24

Parallel circuit