Electricity and Magnetism

Question 1

Law of Electric Charges

Answer 1

States that like charges repel and opposite charges attract.

Question 2

Electrons

Answer 2

Subatomic particles which orbit the nucleus of an atom and are negatively charged. Electrons are found outside the nucleus.

Question 3

Electric Force

Answer 3

The force between charged objects.

Question 4

Two factors determining the strength of electrical force are?

Answer 4

1: size of the charges
2: distance between charges

Question 5

Conductor

Answer 5

materials in which charges can move easily

Question 6

Insulator

Answer 6

materials in which charges cannot move easily

Question 7

Static electricity

Answer 7

The build up of electric charges on an object. ( An object charges by friction because of the rubbing of two objects together can cause electrons to be whipped from one object and transferred to another)

Question 8

Electric discharge

Answer 8

The loss of static electricity as charges move off an object

Question 9

Electric discharge example

Answer 9

Walking on carpet with your fuzzy socks on, negatively charge builds up on your body. touching a metal door knob.

Question 10

Cell

Answer 10

A device that produces an electrical current by converting chemical energy into electric energy.

Question 11

Battery

Answer 11

A device made up of several cells.

Question 12

Current

Answer 12

The rate at which charge passes through a given point.

Question 13

Current SI unit?

Answer 13

Amps

Question 14

Resistance

Answer 14

The opposition to the flow of electric charge.

Question 15

Electrical power

Answer 15

the rate at which electrical energy is used to do work.

Question 16

Circut

Answer 16

a complete closed path through which electric charges flow.

Question 17

Voltage

Answer 17

the amount of energy released as a charge moves between 2 points in the path of a current

Question 18

What is the SI unit of power?

Answer 18

Watts

Question 19

Magnet

Answer 19

any material that attracts iron or materials containing iron

Question 20

magnetic poles

Answer 20

part of a magnet where the magnetic effects are the strongest

Question 21

magnetic field

Answer 21

exist in the region around a magnet in which magnetic forces can act

Question 22

Electromagnetism

Answer 22

interaction between electricity and magnetism

Question 23

Electromagnet

Answer 23

a magnet that consists of a coil of wire wrapped around an iron core

Question 24

Electric motor

Answer 24

a device that changes electrical energy into KE

Question 25

Ohms law

Answer 25

V=IR

Question 26

Resistance formula

Answer 26

R=V/I

Question 27

Current Formula

Answer 27

I=V/R