Your SlideShare is downloading. ×
Paying For Electricity
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×
Saving this for later? Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime – even offline.
Text the download link to your phone
Standard text messaging rates apply

Paying For Electricity

1,744
views

Published on


0 Comments
1 Like
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total Views
1,744
On Slideshare
0
From Embeds
0
Number of Embeds
1
Actions
Shares
0
Downloads
33
Comments
0
Likes
1
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
No notes for slide

Transcript

  • 1. Paying for electricity
    • By the end of the lesson I will know;
    • how to calculate energy use in kWh
    • How to calculate cost
    Starter try to finish off the worksheet from last lesson working out power of the appliance, remember power = energy (in joules)/ time (second)
  • 2. kWh = kW x hr Cost = kWh x cost of 1 unit
  • 3. Device Power (in kW) Time of use (in hours) Energy transferred (in kW h) Computer 0.4 3.0 Heater 2.0 2.0 Kettle 3.0 0.2 Lamp 0.1 5.0 Microwave oven 1.0 2  0.2 Television 0.2 2.0
  • 4. Device Power (in kW) Time of use (in hours) Energy transferred (in kW h) Computer 0.4 3.0 1.2 Heater 2.0 2.0 Kettle 3.0 0.2 Lamp 0.1 5.0 Microwave oven 1.0 2  0.2 Television 0.2 2.0
  • 5. Device Power (in kW) Time of use (in hours) Energy transferred (in kW h) Computer 0.4 3.0 1.2 Heater 2.0 2.0 4.0 Kettle 3.0 0.2 Lamp 0.1 5.0 Microwave oven 1.0 2  0.2 Television 0.2 2.0
  • 6. Device Power (in kW) Time of use (in hours) Energy transferred (in kW h) Computer 0.4 3.0 1.2 Heater 2.0 2.0 4.0 Kettle 3.0 0.2 0.6 Lamp 0.1 5.0 Microwave oven 1.0 2  0.2 Television 0.2 2.0
  • 7. Device Power (in kW) Time of use (in hours) Energy transferred (in kW h) Computer 0.4 3.0 1.2 Heater 2.0 2.0 4.0 Kettle 3.0 0.2 0.6 Lamp 0.1 5.0 0.5 Microwave oven 1.0 2  0.2 Television 0.2 2.0
  • 8. Device Power (in kW) Time of use (in hours) Energy transferred (in kW h) Computer 0.4 3.0 1.2 Heater 2.0 2.0 4.0 Kettle 3.0 0.2 0.6 Lamp 0.1 5.0 0.5 Microwave oven 1.0 2  0.2 0.4 Television 0.2 2.0
  • 9. Device Power (in kW) Time of use (in hours) Energy transferred (in kW h) Computer 0.4 3.0 1.2 Heater 2.0 2.0 4.0 Kettle 3.0 0.2 0.6 Lamp 0.1 5.0 0.5 Microwave oven 1.0 2  0.2 0.4 Television 0.2 2.0 0.4
  • 10. Total energy = 1.2+4.0+0.6+0.5+0.4+0.4 = 7.1 kWh
  • 11. Total cost = 7.1 KWh X 7 p/kWh = 49.7 p
  • 12. a) Calculate the energy transferred, in kW h, when: i) A 1200 W microwave oven is used for 20 minutes. ii) A 2.0 kW electric heater is used for two hours. iii) A 0.6 kW hairdryer is used for 30 minutes.
  • 13. a) Calculate the energy transferred, in kW h, when: i) A 1200 W microwave oven is used for 20 minutes. 1.2 kW x 1/3 h = 0.4 kWh ii) A 2.0 kW electric heater is used for two hours. iii) A 0.6 kW hairdryer is used for 30 minutes.
  • 14. a) Calculate the energy transferred, in kW h, when: i) A 1200 W microwave oven is used for 20 minutes. 1.2 kW x 1/3 h = 0.4 kWh ii) A 2.0 kW electric heater is used for two hours. 2 kW x 2h = 4 kWh iii) A 0.6 kW hairdryer is used for 30 minutes.
  • 15.
    • a) Calculate the energy transferred, in kW h, when:
    • i) A 1200 W microwave oven is used for 20 minutes.
    • 1.2 kW x 1/3 h = 0.4 kWh
    • ii) A 2.0 kW electric heater is used for two hours.
    • 2 kW x 2h = 4 kWh
    • A 0.6 kW hairdryer is used for 30 minutes.
    • 0.6 kW X o.5 h = 0.3 kWh
  • 16.
    • a) Calculate the energy transferred, in kW h, when:
    • i) A 1200 W microwave oven is used for 20 minutes.
    • 1.2 kW x 1/3 h = 0.4 kWh
    • ii) A 2.0 kW electric heater is used for two hours.
    • 2 kW x 2h = 4 kWh
    • A 0.6 kW hairdryer is used for 30 minutes.
    • 0.6 kW X o.5 h = 0.3 kWh
    b)i)Calculate the total energy transferred in a). ii)Calculate the cost of the electricity used in a) if each kW h of energy transferred costs 8 p.
  • 17.
    • a) Calculate the energy transferred, in kW h, when:
    • i) A 1200 W microwave oven is used for 20 minutes.
    • 1.2 kW x 1/3 h = 0.4 kWh
    • ii) A 2.0 kW electric heater is used for two hours.
    • 2 kW x 2h = 4 kWh
    • A 0.6 kW hairdryer is used for 30 minutes.
    • 0.6 kW X o.5 h = 0.3 kWh
    b)i)Calculate the total energy transferred in a). = 0.4 + 4 + 0.3 = 4.7 kWh ii)Calculate the cost of the electricity used in a) if each kW h of energy transferred costs 8 p.
  • 18.
    • a) Calculate the energy transferred, in kW h, when:
    • i) A 1200 W microwave oven is used for 20 minutes.
    • 1.2 kW x 1/3 h = 0.4 kWh
    • ii) A 2.0 kW electric heater is used for two hours.
    • 2 kW x 2h = 4 kWh
    • A 0.6 kW hairdryer is used for 30 minutes.
    • 0.6 kW X o.5 h = 0.3 kWh
    b)i)Calculate the total energy transferred in a). = 0.4 + 4 + 0.3 = 4.7 kWh ii)Calculate the cost of the electricity used in a) if each kW h of energy transferred costs 8 p. Total cost = 4.7 X 8 = 37.6p

×