# 4-Electric Circuits 2

## Slideshow: RC circuits

Slideshow: RC circuits

Textbook: Not well represented in the textbook, but review Ch 16 for DC circuits.

## Objectives:

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.

## Equations:

Equations:

## Common Misconceptions

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.

### To Be Continued . . .

To Be Continued . . .