13.4 How Do We Reduce The Consumption Of Electricity?

Question 1

What is the SI unit of power

Answer 1

watt (W)

Question 2

What is power

Answer 2

amount of electrical energy used for conversion to other forms of energy per unit time

Question 3

What is the measurement used for electrical energy consumption

Answer 3

kilowatt-hours (kWh)

Question 4

What is the formula of calculating kWh

Answer 4

Electrical energy (kWh)= Power (kW) x Time (h)

Question 5

What does 1kW equal

Answer 5

1 kw= 1000 W

Question 6

How to calculate joule when given kWh

Answer 6

1kWh= 1kW x 1h
= 1000W x 3600s
= 3 600 000 J

Question 7

What are 5 ways to conserve energy in households?

Answer 7

-buy electrical appliances that have energy labels with 3 or more ticks
-switch off air conditioner after a short while and switch to fan
-switch of water heater after use
-use vacuum flask instead of electric hot water dispenser
-switch off power socket to reduce standby power