Chapter 23 Series Parallel Circuits Series Circuit A Slides: 27 Download presentation Chapter 23 Series & Parallel Circuits Series Circuit • A circuit with only one path Parallel Circuit • A circuit with several paths for current flow Series Circuit • The current is constant • I = constant Parallel Circuit • The voltage is constant • V = constant Series Circuit • The voltage drop is the sum of individual voltage drops • VT = V 1 + V 2 + V 3 Parallel Circuit • The total current is the sum of the currents for each path • IT = I 1 + I 2 + I 3 Series Circuit • The total resistance is the sum of individual reisitances • RT = R 1 + R 2 + R 3 Series Circuit • The current = voltage over the sum of individual resistances • I = V/(R 1 + R 2 + R 3 ) Parallel Circuit • 1/RT = 1/R 1 + 1/R 2 etc Ammeter • A device with tiny resistance that measures current in any part of a circuit Ammeter • Must be places in series with the circuit to measure the current. Volt Meter • A device with tiny resistance that measures voltage in any part of a circuit Volt Meter • Must be places parallel with the circuit to measure the voltage. Fuse • A fuse or circuit breaker protects against dangerously high current Ground-fault Interrupter • Opens a circuit where a shock hazard exists Short Circuit • A circuit with very low resistance A current of 12 A flows through a 120 V series circuit has resistors of 1. 0 W, 2. 0 W, 3. 0 W, & X W. Calculate: Rx, V 1, V 2, V 3, & Vx A current flows through a 120 V parallel circuit has resistors of 1. 0 W, 2. 0 W, 3. 0 W, & 4 W. Calculate: RT, I 1, I 2, I 3, I 4, & IT Problems Calculate the following: • R 1 = Work problems 1 – 4 on P 404 & 405 in the classroom set of Physics books. Work problems 5 - 10 on P 406 - 408 in the classroom set of Physics books. Work problems 11 15 on P 410 & 411 in the classroom set of Physics books. Work problems 16 18 on P 414 & 415 in the classroom set of Physics books. Answer the questions on P 417 & 418 in the classroom set of Physics books. Work problems A on P 418 - 420 in the classroom set of Physics books.