Ohm’s Law /Power 

Ohm’s Law                             :    V = I R        

  •  V electric potential difference in  V     
  •  I   electric current in A   
  •  R  electric resistance in  Ω

Power      :    P = V I       

  • P  power in W

Example

An electric kettle has a power of  2.0 x 103  W . The voltage is  2.3 x 102 V

Calculate the electric resistance of the heating element.

P = V I

2.0 x 103 = (2.3 x 102)(I)

I = (2.0 x 103)/(2.3 x 102) = 8.70 A

V = I R

2.3 x 102 = 8.70 x R

R = 26.4 Ω = 2.6 x 101  Ω

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