Electricity

Question 1

Appliances with metal; casing should be connected to which wire ?

Answer 1

• Appliances with metal casing should be connected to the earth wire .
  o If the live wire breaks ,comes to contact with casing ,the earth wire could provide a low resistance path for the current to space to .

Question 2

Current ,voltage and resistance in parrallel and series

Answer 2

• PARRALELL = SHARE CURRENT AND VOLTAGE IS SAME THROUGHOUT
• MORE CFOMPANENT IN PARRALELL =LOWER RESISTANCE
• SERIES =VOLTAGE ADDS UP ,NOT SHARED ,CURRENT IN THE SAME EVERYWHERE
• HIGHER RESISTANCE = HIGHER VOLTAGE

Question 3

Diif between series and parralell

Answer 3

SERIES PARRALLEL
One switch to all bulbs Switches to control all bulbs
A break causes a gap A break only affects bulbs on the same branch
Energy supplied is shared Each branch receives the same voltage

Question 4

What is static electricty ?

Answer 4

• Static electricity is the build up of charges

Question 5

What happens when a plane flys

Answer 5

• As it flies in the sky ,friction causes bit to become charged with static electricity .When it lands it escapes to earth as a spark of electricity and during refueling this could cause an explosion .
• When the areophane is earthed ,the build up charges pass onto the Earth