Topic 7

Question 1

From grid to home

Answer 1

Electricity starts at a power generating station. The energy is then stepped up to 500kV in a transformer to send it long distances. It is then sent to a substation and stepped down to 60-138 kV. It travels to a distribution station, stepped down to 25kV, travel to a transformer and stepped down to 240/120V

Question 2

Wires

Answer 2

Hot wire- black insulated wire used for ordinary appliances
Ground wire- either bare cooper or green insulated: reduces shock hazards by safely channelling and leaked current on metal components back into the ground
neutral wire-

Question 3

Electrical code

Answer 3

set of standards for electrical work

Question 4

Power(W)

Answer 4

P=IV V=P/I I=P/V

Question 5

kWh

Answer 5

kilawatts X hours

kWh X money

Question 6

Efficiency

Answer 6

E=Out/In Energy= PT

Question 7

Ener-guide

Answer 7

labels on electrical devices used to help make comparisons on larger appliances.

Question 8

Safety in home and outside

Answer 8

Inside- do not overcrowd an outlet
Never touch or clean appliances that are still plugged in
Replace frayed or worn out electrical cords

Outside- never allow your body or something you’re holding to touch live wires
Never use underground or frayed two prong cords outside
do not operate electrical equipment when raining
Call before you dig