1.1 Changes in energy stores Energy is transferred from one energy store to another by: * waves, *an electric current, *Heating energy stores: Chemical Kinetic gravitational elastic PE thermal Energy can be stored in different ways Increase in the Gravitational PE store of the lift Electric Current in the wires (This is the relevant change to an energy store )

1.1 Changes in energy stores Energy is transferred from one energy store to another by: * waves *an electric current *Heating energy stores: Chemical Kinetic gravitational elastic PE thermal Energy can be stored in different ways Increase in the Gravitational PE store of the lift Electric Current in the wires (This is the relevant change to an energy store )

1.1 Changes in energy stores Energy is transferred from one energy store to another by: * waves *an electric current *Heating energy stores: Chemical Kinetic gravitational elastic PE thermal Energy can be stored in different ways Increase in the Gravitational PE store of the lift Electric Current in the wires (This is the relevant change to an energy store )

1.1 Changes in energy stores Increase in the thermal energy store of the surroundings. Caused by the heating from the hot motor Increase in the thermal energy store of the motor Caused by the work done against the force of friction Increase in the gravitational PE store of the lift Electric Current in the wires Caused by the lift rising at a steady speed Increase in the thermal energy store of the surroundings. Caused by the sound waves from the lift machinery

1.1 Changes in energy stores Increase in the thermal energy store of the surroundings. Caused by the heating from the hot motor Increase in the thermal energy store of the motor Caused by the work done against the force of friction Increase in the gravitational PE store of the lift This does not equal the KE of the lift! Electric Current in the wires Caused by the lift rising at a steady speed Increase in the thermal energy store of the surroundings. Caused by the sound waves from the lift machinery

1.1 Changes in energy stores Increase in the thermal energy store of the surroundings. Caused by the heating from the hot motor Increase in the thermal energy store of the motor Caused by the work done against the force of friction Increase in the gravitational PE store of the lift This does not equal the KE of the lift! Electric Current in the wires Caused by the lift rising at a steady speed Increase in the thermal energy store of the surroundings. Caused by the sound waves from the lift machinery

1.1 Changes in energy stores Increase in the thermal energy store of the surroundings. Caused by the heating from the hot motor Increase in the thermal energy store of the motor Caused by the work done against the force of friction Increase in the gravitational PE store of the lift This does not equal the KE of the lift! Electric Current in the wires Caused by the lift rising at a steady speed Increase in the thermal energy store of the surroundings. Caused by the sound waves from the lift machinery

1.9 Changes in energy stores Increase in the thermal energy store of the surroundings. Caused by the heating from the hot motor Increase in the thermal energy store of the motor Caused by the work done against the force of friction Increase in the gravitational PE store of the lift This does not equal the KE of the lift! Electric Current in the wires Caused by the lift rising at a steady speed Increase in the thermal energy store of the surroundings. Caused by the sound waves from the lift machinery ( less than 1% )

1.9 Energy and power

Multiples and prefixes symbol example x 103 ( x 1000) x 103 ( x 1,000,000) x 109 x 1012 x 1015 x 1018 kilo k km mega M MΩ giga G GW tera T THz peta P Ps exa E Em also, but rarely used: deca = x 10, hecto = x 100

2 million kettles at 3kW each = 6GW Mains filament lamp 10,000 W cooker 2 million kettles at 3kW each = 6GW P= E so E = Pt t E = 5000W x 20s E = 100,000 J

2 million kettles at 3kW each = 6GW Mains filament lamp 10,000 W cooker 2 million kettles at 3kW each = 6GW P= E so E = Pt t E = 5000W x 20s E = 100,000 J

2 million kettles at 3kW each = 6GW Mains filament lamp 10,000 W cooker 2 million kettles at 3kW each = 6GW P= E so E = Pt t E = 5000W x 20s E = 100,000 J

2 million kettles at 3kW each = 6GW Mains filament lamp 10,000 W cooker 2 million kettles at 3kW each = 6GW P= E so E = Pt t E = 5000W x 20s E = 100,000 J % efficiency = OP energy x 100% IP energy = 12,000 x 100% 100,000 = 12%

2 million kettles at 3kW each = 6GW Mains filament lamp 10,000 W cooker 2 million kettles at 3kW each = 6GW P= E so E = Pt t E = 5000W x 20s E = 100,000 J % efficiency = OP energy x 100% IP energy = 12,000 x 100% 100,000 = 12%

2 million kettles at 3kW each = 6GW Mains filament lamp 10,000 W cooker 2 million kettles at 3kW each = 6GW P= E so E = Pt t E = 5000W x 20s E = 100,000 J % efficiency = OP energy x 100% IP energy = 12,000 x 100% 100,000 = 12%

a. P = E t P =

a. P = E t P = 1,500,000 J 50 s P =

a. P = E t P = 1,500,000 J 50 s P = 1,500,000 W 50 P =

a. P = E t P = 1,500,000 J 50 s P = 1,500,000 W 50 P = 30,000 W P =

a. P = E t P = 1,500,000 J 50 s P = 1,500,000 W 50 P = 30,000 W P = 30 kW

a. P = E t P = 1,500,000 J 50 s P = 1,500,000 W 50 P = 30,000 W P = 30 kW b. % efficiency = OP power x 100% IP power = 30kW x 100% 100kW = 30 %

a. P = E t P = 1,500,000 J 50 s P = 1,500,000 W 50 P = 30,000 W P = 30 kW b. % efficiency = OP power x 100% IP power = 30kW x 100% 100kW = 30 %

a. P = E t P = 1,500,000 J 50 s P = 1,500,000 W 50 P = 30,000 W P = 30 kW b. % efficiency = OP power x 100% IP power = 30kW x 100% 100kW = 30 %

a. P = E t P = 1,500,000 J 50 s P = 1,500,000 W 50 P = 30,000 W P = 30 kW b. % efficiency = OP power x 100% IP power = 30kW x 100% 100kW = 30 %

Increase in the thermal energy store of the .......... Electric Current in the wires Increase in the thermal energy store of the .................... Caused by the heating from the hot shower heater ( less than 1% )

Increase in the thermal energy store of the water Electric Current in the wires Increase in the thermal energy store of the surroundings. Caused by the heating from the hot shower heater ( less than 1% )

P= E so E = Pt t E = 12 kW x (20 x60 x4 ) s E = 12 k W x 4800 s E = 57,600 kJ E = 57.6 MJ Increase in the thermal energy store of the water Electric Current in the wires Increase in the thermal energy store of the surroundings. Caused by the heating from the hot shower heater ( less than 1% )

P= E so E = Pt t E = 12 kW x (20 x60 x4 ) s E = 12 k W x 4800 s E = 57,600 kJ E = 57.6 MJ Increase in the thermal energy store of the water Electric Current in the wires Increase in the thermal energy store of the surroundings. Caused by the heating from the hot shower heater ( less than 1% )

P= E so E = Pt t E = 12 kW x (20 x60 x4 ) s E = 12 k W x 4800 s E = 57,600 kJ E = 57.6 MJ Increase in the thermal energy store of the water Electric Current in the wires Increase in the thermal energy store of the surroundings. Caused by the heating from the hot shower heater ( less than 1% )

P= E so E = Pt t E = 12 kW x (20 x60 x4 ) s E = 12 k W x 4800 s E = 57,600 kJ E = 57.6 MJ Increase in the thermal energy store of the water Electric Current in the wires Increase in the thermal energy store of the surroundings. Caused by the heating from the hot shower heater ( less than 1% )

P= E so E = Pt t E = 12 kW x (20 x60 x4 ) s E = 12 k W x 4800 s E = 57,600 kJ E = 57.6 MJ Increase in the thermal energy store of the water Electric Current in the wires Increase in the thermal energy store of the surroundings. Caused by the heating from the hot shower heater ( less than 1% )

P= E so E = Pt t E = 12 kW x (20 x60 x4 ) s E = 12 k W x 4800 s E = 57,600 kJ E = 57.6 MJ Increase in the thermal energy store of the water Electric Current in the wires Increase in the thermal energy store of the surroundings. Caused by the heating from the hot shower heater ( less than 1% )