electric circuits study sheet

Electric Circuits (P9)

1.    P = VI, P=I²R

2.    V = IR

3.    E = Pt

4.     Circuit components:

(Sources, switches, resistors [fixed/variable], lamps, ammeters, voltmeters, fuses, magnetic coils, transformers)

5.     Current in a series circuit: The current in a series circuit is the same at any point I₁ = I₂ = I₃

6.     Potential difference in a series circuit: The sum of all the p.d.s across the components is equal to the total p.d. across the supply V_T = V₁ + V₂

7.     Resistance of two or more resistors in a series circuit: The sum of the resistance of all the resistors is equal to the total resistance R_T = R₁ + R₂

8.     Current in a parallel circuit: The current from the source is equal to the sum of the currents in separate branches I_T = I₁ + I₂

9.     Potential difference in a parallel circuit: The p.d. across each branch of the circuit is the same V₁ = V₂ = V₃

10. Resistance in a parallel circuit: The total resistance in the circuit should be less than the resistance of…