Electrical circuits

Cards (6)

Kirchhoffs second law states that the sum of the emf is equal to the sum of pd in a closed loop. Conservation of energy
Resistors in circuits
In series - R = R1 + R2…
In parallel - 1/R = 1/R1 + 1/R2…
emf (E) = terminal pd (V) + 'lost volts' (Ir)
lost volts = current (I) x internal resistance (r)
emf (E) = current (I) (resistance (R) + internal resistance (r))
V = -rI + E
y = mx + c therfore the gradient = internal resistance
potential dividers Vout = (R2/R1 + R2) x Vin