Part A: Introduction (01:28)

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Electricity powers motors in refrigerators, cranes, trains, fans, communications, and lights. Circuits require a power source, a load, wires, and a switch.

Part B: A Very Simple Electrical Circuit (04:58)

Electrons need to flow out of the battery, to the light globe, and return in a continuous loop. When a switch is released, it interrupts the circuit and current cannot flow. Electricity flows from power stations, through transmission lines, and into buildings.

Part C: Circuit Symbols and Circuit Diagrams (02:37)

Learn the icons for ammeter, voltmeter, SPDT switches, diodes, LEDs, resistors, capacitors, fuses, motors, speakers, and wires. In complicated circuits, wires cross over each other; use a bridge symbol. Circuit diagrams need to clearly show where the electrical current flows.

Part D: Series and Parallel Connections (08:34)

Learn reasons light globes are not connected in a series. Parallel connections are used because the other parts within the circuit do not affect the globe's brightness. Electronic circuits contain components in multiple levels of overlapping series and parallel connections.

Credits: Episode 2: Electric Currents (00:20)

Credits: Episode 2: Electric Currents