9.1 SERIES AND PARALLEL CIRCUITS Name:Date:Block:
(Reference: BC Science 9 pp. 306 – 319) Lights can be connected together in different ways.
Some decorative lights are connected in such a way that if one bulb burns out the rest of the lights _______ work.
Lights in your house are connected so that if one bulb burns out the lights in the rest of the house ________ work.
These examples illustrate the difference between lights that are connected in ___________ and lights that are connected in _________.
SERIES CIRCUIT series circuit: ___________________________________________
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There is only ______ pathway for current to flow.
VOLTAGE: the ______ of the voltages lost on the loads equals the total voltage supplied by the battery.
CURRENT: current measured anywhere in the series circuit will be ______________.
RESISTANCE: resistors placed in series ___________ the total resistance of the circuit.
As a result, the total current throughout the circuit _________________.
EXAMPLE 1: Find the unknown voltage at V, and current at A, the resistance at each resistor and the total resistance in the following circuit.
PARALLEL CIRCUITS parallel circuits: _______________________________________
________________________________________________________________________________________________________ There are ____________ pathways for current to flow.
Adding more pathways lowers resistance. junction point: _______________________________________
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• VOLTAGE: voltage is _____________ through each pathway.
• CURRENT: the ________ of the current on each pathway adds up to the total current supplied by the battery.
• RESISTANCE: resistors placed in parallel _____________ the total resistance of the circuit.
As a result, the total current through the circuit ______________. (A path with less resistance will be able to have more electrons travel on it and will therefore have greater current on it).
EXAMPLE 2: Find the unknown voltage at V, and current at A, the resistance at each resistor and the total resistance in the following circuit.