Current Electricity

Formulas:

• I = Q/T 

  • • I = current in Amperes (A)

    • Q = charge in Coloumbs (C)

    • t = time in seconds (s)

• E = W/Q

• V = W/Q / V = IR

  • • V= potential diff. in Volts (V)

    • E = E.M.F in Volts (V)

    • W = work done in Joules (J)

    • Q = charge in Coulombs (C)

• R = V/I / R = p (L/A) 

  • • R = Resistance (Ohms)

    • p = Resistivity

    • L = Length of wire

    • A = thickness of wire

Factors affecting Resistance:

• Temperature (>, >)

• Length of wire (>, >)

• Thickness of wire ((>, <)

• Resistivity of material of wire