Y11 INTERVENTION : Energy, efficiency and kWh

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Presentation transcript:

Y11 INTERVENTION : Energy, efficiency and kWh 1. 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

1. 5 mins

1. 5 mins Efficiency = Useful E Total E Efficiency = 720 1200 Heat / thermal Cost = kWh x pence / kwh Cost = 800kWh x 15p Cost = 12000p = £120

Y11 INTERVENTION : Energy, efficiency and kWh 1. 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. 10 mins

2. 10 mins

2. 10 mins

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

2. 10 mins Cost saving = kWh saving x pence / kwh saving = (1.1- 0.9) kWh x 15p Saving = 0.2 x 15p = 3p Less electricity is needed Fewer power stations are needed Less fuel is burned

2. 10 mins Efficiency = Useful E Total E 0.95 x 8 = 7.6 kJ £ 0.15 = 1 kWh 200 kWh = 8 kW x hours £ 1 = 1 kWh 0.15 200 kWh = 25 hours 8 kW £ 30 = 1 kWh x30 0.15 £ 30 = 200 kWh

Y11 INTERVENTION : Energy, efficiency and kWh 1. 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

3. 5 mins

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

Y11 INTERVENTION : Energy, efficiency and kWh 1. 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