Physics - Chapter 21

• Resistors limit the flow of charge in a circuit
• Series resistors add
• The same current (I) flows through each resistor in series
• Individual resistors in series don't get the total source voltage but divide it
• Resistors in PARALLEL add RECIPROCALLY
• Each resistor in parallel has the same voltage of the source applied to it
• Electromotive force (emf) - the potential difference of a source when no current is flowing (Units: Volts)
• Junction rule: the sum of all currents entering a junction must equal the sum of all currents leaving the junction. Application of the conservation of charge
• Loop rule: The algebraic sum of changes in potential around any closed circuit must be 0. Application of conservation of energy.