Electrical Energy and Power

 
3.4  Electrical Energy and Power
 
  Relationship between\(E\,,V\,,I\) and \(t\)  
  \(E = V \,I\, t\)  
     
 
 

 Relationship between\(P\,,V\) and \(I\)

 
  \(P=V\,I\)  
     
 
 

  Relationship between\(P\,,V\,,I\) and \(R\)

 
 

 \(P=I^2\,R\)

\(P=\dfrac{V^2}{R}\)

 
     
 
  Energy consumed for electrical devices, \(E\)  
  \(E = P\,t\)  
     
 
  Cost of consumption  
  \(\text{Total cost} = E \times \text{Cost per kWh}\)  
     
 
 

Electrical Energy and Power

 
3.4  Electrical Energy and Power
 
  Relationship between\(E\,,V\,,I\) and \(t\)  
  \(E = V \,I\, t\)  
     
 
 

 Relationship between\(P\,,V\) and \(I\)

 
  \(P=V\,I\)  
     
 
 

  Relationship between\(P\,,V\,,I\) and \(R\)

 
 

 \(P=I^2\,R\)

\(P=\dfrac{V^2}{R}\)

 
     
 
  Energy consumed for electrical devices, \(E\)  
  \(E = P\,t\)  
     
 
  Cost of consumption  
  \(\text{Total cost} = E \times \text{Cost per kWh}\)