Conservation Of Energy & Charge In Circuits Flashcards Preview

Physics Section 3: Current Electricity > Conservation Of Energy & Charge In Circuits > Flashcards

Flashcards in Conservation Of Energy & Charge In Circuits Deck (5)
Loading flashcards...
0

What is Kirchhoff's first law

The total current ENTERING a junction= the total current LEAVING it
Same applied to charge (current is rate of flow of charge)

1

What does Kirchhoff's second law say

The total e.m.f AROUND a series CIRCUIT = the sum of all the p.d's ACROSS each COMPONENT
e=ZIR

2

What are the two Kirchhoff's laws based an

Doesn't get lost or used up
Conserved

3

4 facts series/parallel

1) Same CURRENT component (and CHARGE)/SPLIT enter dif jun I=I1+I2+I3

2) e.m.f split components same junction E=V1+V2+V3/SAME enter jun
3) V=IR, So I if constant IRtotal=IR1+IR2+IR3}{ V/Rtotal=V/R1+V/R2+V/R3
4) Rtotal=R1+R2+R3. 1/Rtotal=1/R1+1/R2+1/R3

4

Junctions split......
Components split....

Current
Voltage