4-Electric Circuits 2
Textbook: Not well represented in the textbook, but review Ch 16 for DC circuits.
Objectives:
Basically all the stuff from AP Physics 1, but now with capacitors included
resistivity depends on substance
use Kirchhoff's loop rules and junction rules to predict & test values (like power, potential difference and current) for resistors, capacitors and sources of EMF when changing their arrangement (parallel, series and combo)
Use Kirchhoff's rules as part of an explanation of energy and/or charge conservation
Analyze a non-ohmic resistor and internal resistance of a battery
Tell how capacitors work differently when first connected, when fully charged and when first connected in a discharging state.
Test your understanding of how basic series and parallel circuits work with the Crack The Circuit game at UniverseAndMore.
Equations:
Common Misconceptions
Simple Circuits
Resistors consume charge.
Electrons move quickly (near the speed of light) through a circuit.
Charges slow down as they go through a resistor.
Current is the same thing as voltage.
There is no current between the terminals of a battery.
The bigger the container, the larger the resistance.
A circuit does not have form a closed loop for current to flow.
Current gets "used up" as it flows through a circuit.
A conductor has no resistance.
The resistance of a parallel combination is larger than the largest resistance.
Current is an excess charge.
Charges that flow in circuit are from the battery.
The bigger the battery, the more voltage.
Power and energy are the same thing.
Batteries create energy out of nothing.
AC Circuits
Charges move all the way around a circuit and all the way back.
Voltage and current remain constant as in DC circuits.
Energy is not lost in a transformer.
A step-up transformer gives you something more for less input.
Transformers can be used to change DC voltages.
Electrical companies supply the electrons for your household current.