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Characteristics of Series and Parallel Circuits Characteristics of series circuits: 1 path for current 1. current is the same everywhere (ammeter operation) IT = I1 = I2 =I3 2. voltage is different across different resistances VT = V1 + V2 + V3 (voltmeter operation) 3. total resistance is equal to the sum of the resistances R = R1 + R2 + R3 4. a break in the circuit stops all current Characteristics of parallel circuits: more than 1 path for current 1. current is different in different resistances, but the total current is equal to the sum of the currents in all the branches IT = I1 + I2 + I3 2. voltage is the same across all resistances VT = V1 = V2 =V3 3. total resistance is less than the sum of the individual resistances VT/RT = V1/R1 +V2/R2 + V3/R3 1/RT = 1/R1 + 1/R2 + 1/R3 4. a break in the circuit only stops current in the branch where the break occurs