# Physics P1

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- Created by: Emma Edgeley
- Created on: 05-01-14 09:00

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- Physics P1
- P1A
- P1B
- choosing electrical appliances
- weigh up pros and cons
- energy consumption
- energy=power x time

- cost effectiveness
- cost=no. of units x price per unit
- no. of units used= power(kw) x time (hours)

- cost=no. of units x price per unit

- sankey diagrams
- no. of energy in divided by no. of squares =value of 1 square

- efficiency= useful energy out ÷ total energy in
- efficiency= useful energy out ÷ total power in

- 9 types of energy
- light
- electrical
- sound
- kinetic
- nuclear
- thermal
- gravitational potential
- stored energy

- elastic potential
- stored energy

- chemical

- specific heat capacity
- shc= energy÷ mass x temp change

- payback time= initial cost ÷ annual saving
- heat transfer
- conduction
- infared radiation
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