Easyphysics

 P1: GCSE Science - EDEXCEL
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Glossary
Formulae

Did you know? 

The power is usually marked on the electric appliance . A kettle marked with 2 kW means it converts 2000 joules of electrical energy into heat in one second.

 

      

 P1 Power 

Syllabus Summary Questions Answers

Appliance Voltage (V) Current (A) Power (W)
Fridge 230 10 2300
Radio 12 0.5 6
iPod 4 0.25 1

 See also the working out below table.

 Fridge
  Power = Voltage x current

  Power = 230 x 10

  Power = 2300 W
 Radio: Higher tier only
 Current = Power ÷ voltage

 Current = 6 ÷ 12

 Current = 0.5 A
 i-Pod: Higher tier only
  Voltage = Power ÷ current

  Voltage = 1 ÷ 0.25

  Voltage = 4 V