# electric circuits study sheet

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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 VT = 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 RT = R1 + R2

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

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