# electric circuits study sheet

- Created by: hikari sakurai
- Created on: 12-12-11 08:44

Electric Circuits (P9)

**1. ** **P = VI, P=I ^{2}R**

**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 **I _{1} = I_{2} = I_{3}**

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} = V_{1} + V_{2}**

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} = R_{1} + R_{2}**

8. *Current* in a parallel circuit: The current from the source is equal to the sum of the currents in separate branches **I _{T} = I_{1} + I_{2}**

9. *Potential difference* in a parallel circuit: The p.d. across each branch of the circuit is the same **V _{1} = V_{2} = V_{3}**

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

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