Electricity & Magnetism Unit. Understanding Circuits. Objectives. Recognize and sketch examples of series and parallel circuits. Describe a short circuit and why a short circuit may be a dangerous hazard.
How do series and parallel circuits work?
*Students read Section 20.1 AFTER Investigation 20.1
Rtotal = R1 + R2 + R3...
Individual resistances (W)
Parallel circuits have two big advantages over series circuits:
1. Each device in the circuit sees the full battery voltage.
2. Each device in the circuit may be turned off independently without stopping the current flowing to other devices in the circuit.
P = VI
Avg. current (amps)
P = VI x pf