Physics Quicksheets - DC and AC Circuits
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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.
Ohm's Law and Resistance
V = IR
*can be applied to entire circuit or individual resistors.
Circuits - Resistance
Opposition to the flow of charge.
*Resistance increases with increasing temperatures with most conductors)
SI units: Ohm (Ω) =
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.
- I = Constant
- Reff = R1 + R2 + R3 +...
- Veff = V1 + V2 + V3 + ...
- V = Constant
Power Dissipated by Resistors
SI units: Watt (W) = J/s
the ability to store charge per unit voltage.
It is given by:
= 8.85 x 10-12
SI units: Farad (F) =
Capacitors in Parallel:
Capacitors in Series:
Energy Stored by Capacitors
Battery Internal Resistance (r): PG 226
nonconducting material that increases capacitance.
Cnew = kCold
K = constant dependent on material
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