- Current Rule or Junction Rule (conservation of charge)
- The algebraic sum of the currents entering any junction must equal the sum of the currents leaving that junction.
- Therefore, in a series circuit the current is the same everywhere.
- Voltage Rule or Loop Rule (conservation of energy)
- The algebraic sum of the potential differences (voltage drops) around a closed conducting loop must equal zero.
- Therefore, components connected in parallel have the same voltage across them.
where voltage V is in volts, resistance R is in ohms and current I is in amperes.
where power P is in Watts, voltage V is in volts, resistance R is in ohms and current I is in amperes.
Any two-terminal network of resistors and voltage sources is equivalent to a single resistor in series with a single voltage source.
1 ampere = 1 coulomb/second
1 coulomb = 1 ampere · second
1 farad = 1 coulomb/volt
1 joule = 1 newton · meter
1 newton = 1 kg · meter/second2
1 ohm = 1 volt/ampere
1 volt = 1 joule/coulomb
1 Watt = 1 joule/second
|Charge, electrical||q, Q, e||coulomb||C|