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
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.