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 V T = V 1 + V 2 + V 3

Parallel Circuit The total current is the sum of the currents for each path I T = I 1 + I 2 + I 3

Series Circuit The total resistance is the sum of individual reisitances R T = 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/R T = 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 , 2.0 , 3.0 , & X . Calculate: R x, V 1, V 2, V 3, & V x

A current flows through a 120 V parallel circuit has resistors of 1.0 , 2.0 , 3.0 , & 4 . Calculate: R T, I 1, I 2, I 3, I 4, & I T

Problems

Calculate the following: R1 =

Work problems 1 – 4 on P 404 & 405 in the classroom set of Physics books.

Work problems on P in the classroom set of Physics books.

Work problems on P 410 & 411 in the classroom set of Physics books.

Work problems 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 in the classroom set of Physics books.