Slide 1

ELECTRICITY

Slide 2

W HAT IS E LECTRICITY ? Energy possessed by an object when electricity passes though it. Electricity from power stations Electricity from batteries Potential energy in fuelskinetic energyelectrical energy + heat energy Chemical potential energy in fuelselectrical energy + heat energy

Slide 3

U SES OF E LECTRICITY Light Includes light bulbs, lamps Enables one to see things clearly LASER Medical, applications; entertainment value

Slide 4

U SES OF E LECTRICITY Sound from electrical signals into sound waves

Slide 5

U SES OF E LECTRICITY Heating effect Appliances have a heating element which heats up and releases heat energy when an electrical current flows through it.

Slide 6

U SES OF E LECTRICITY Magnetic effect These appliances contain electromagnets which are made of a wire coiled around a magnetic material such as iron or steel. When an electric current passes through the wire, a magnetic field is set up and the magnetic material can act as a magnet to attract other objects.

Slide 7

E LECTROMAGNETISM AND COMPASS A compass may be used to show the magnetic effect of an electric current. Needle in a compass is a magnet; it has a North and a South end. Electric current has a magnetic field The compass needle deflects in the presence of a magnetic field set up by an electric current.

Slide 8

ELECTROMAGNETS

Slide 9

F ACTORS AFFECTING THE STRENGTH OF AN ELECTROMAGNET Number of turns

Slide 10

F ACTORS AFFECTING THE STRENGTH OF AN ELECTROMAGNET Presence of a magnetic material

Slide 11

F ACTORS AFFECTING THE STRENGTH OF AN ELECTROMAGNET Number of batteries

Slide 12

U SES OF ELECTROMAGNETS Magnetic cranes Electric Motor Electric Bell

Slide 13

C ONSERVATION OF E LECTRICITY Why is there a need to conserve electricity? What do you do to conserve electricity? What conservation measure do you not practice but wish you can?

Slide 14

P HANTOM P OWER /P OWER V AMPIRISM Based on the video, answer the following questions 1. What is vampire power? 2. In what ways is vampire power or phantom power observed? 3. What is the effect of this phenomenon? 4. What realistic vampire power saving tips are suggested?

Slide 15

SOURCES http://dvice.com/archives/2009/03/shift_how_i_bec.php Istockphoto.com Youthenergy.ca http://www.youtube.com/watch?v=G8iahHwEfNg http://www.youtube.com/watch?v=mNcHUrg9EQY&feat ure=related http://www.youtube.com/watch?v=KlG0xk93J- E&NR=1&feature=fvwp http://www.youtube.com/watch?v=29hlNQsM8Jo http://www.youtube.com/watch?v=3OEU1oAEIIE&NR=1 http://www.youtube.com/watch?v=EJeAuQ7pkpc&NR=1 &feature=fvwp