1. Y11 INTERVENTION : Energy, efficiency and kWh1.
5 mins EXAM CONDITIONS demand 1 Question (grade 4/5)
5 mins go through mark scheme 2.
10 mins Walking talking demand 2 Question (grade 6/7) 3.
5 mins EXAM CONDITIONS demand 3 Question (grade 8/9)
5 mins go through mark scheme

2. 1.
5 mins

3. 1. 5 mins Efficiency = Useful E Total E Efficiency = 720
1200
Heat / thermal
Cost = kWh x pence / kwh
Cost = 800kWh x 15p
Cost = p = £120

4. Y11 INTERVENTION : Energy, efficiency and kWh1.
5 mins EXAM CONDITIONS demand 1 Question (grade 4/5)
5 mins go through mark scheme 2.
10 mins Walking talking demand 2 Question (grade 6/7) 3.
5 mins EXAM CONDITIONS demand 3 Question (grade 8/9)
5 mins go through mark scheme

5. 2.
10 mins

6. 2.
10 mins

7. 2.
10 mins

8. 2. 10 mins Kinetic thermal sound Warms up the surroundings
/ raises the thermal energy store of the surroundings

9. 2. 10 mins Cost saving = kWh saving x pence / kwh
saving = ( ) kWh x 15p
Saving = x 15p = 3p
Less electricity is needed
Fewer power stations are needed
Less fuel is burned

10. 2. 10 mins Efficiency = Useful E Total E 0.95 x 8 = 7.6 kJ
£ = 1 kWh
200 kWh = 8 kW x hours
£ 1 = 1 kWh
0.15
200 kWh = hours
8 kW
£ 30 = 1 kWh x30
0.15
£ 30 = 200 kWh

11. Y11 INTERVENTION : Energy, efficiency and kWh1.
5 mins EXAM CONDITIONS demand 1 Question (grade 4/5)
5 mins go through mark scheme 2.
10 mins Walking talking demand 2 Question (grade 6/7) 3.
5 mins EXAM CONDITIONS demand 3 Question (grade 8/9)
5 mins go through mark scheme

12. 3.
5 mins

13. 3. 5 mins ∆ GPE = mg ∆h ∆ GPE = 18 x10 x 2.5 ∆ GPE = 450J
Friction occurs between clothing and slide
Electron/ charge transfer occurs
All charges on hair are :
the same type of charge / positive / negative
Hairs are repelling

14. Y11 INTERVENTION : Energy, efficiency and kWh1.
5 mins EXAM CONDITIONS demand 1 Question (grade 4/5)
5 mins go through mark scheme 2.
10 mins Walking talking demand 2 Question (grade 6/7) 3.
5 mins EXAM CONDITIONS demand 3 Question (grade 8/9)
5 mins go through mark scheme