# Physics Quicksheets - DC and AC Circuits

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1. Direct Current

Current:
Current: the flow of electric charge.  Current is given by:

SI units: Amp (A) = C/s

*The direction of current is the direction positive charge would flow, or from high to low potential.
2. Ohm's Law and Resistance
V = IR

*can be applied to entire circuit or individual resistors.
3. Circuits - Resistance

Opposition to the flow of charge.

*Resistance increases with increasing temperatures with most conductors)

SI units: Ohm (Ω) =
4. Circuit Laws

Kirchoff's Laws:
1. At any junction within a circuit, the sum of current flowing into that point must equal the current leaving.

2. The sum of voltage sources equals the sum of voltage drops around a closed circuit loop.
5. Alternating Current:

6. Series Circuits

• I = Constant
• Reff = R1 + R2 + R3 +...
• Veff = V1 + V2 + V3 + ...
7. Parallel Circuits:

• V = Constant

Ieff = I1 + I2 + I3 + ...
8. Power Dissipated by Resistors

SI units: Watt (W) = J/s
9. Capacitance
the ability to store charge per unit voltage.

It is given by:   or

ε0 = 8.85 x 10-12 C2/N*m2

10. Capacitors in Parallel:

11. Capacitors in Series:

12. Energy Stored by Capacitors

13. Battery Internal Resistance (r): PG 226
14. Dielectrics
nonconducting material that increases capacitance.

Cnew = kCold

K = constant dependent on material
 Author: awc1990 ID: 227425 Card Set: Physics Quicksheets - DC and AC Circuits Updated: 2013-07-22 17:36:19 Tags: Physics Quicksheets DC AC Circuits Folders: Description: Kaplan Quicksheets Chapter 8 Show Answers: