Series and Parallel circuits

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Presentation transcript:

Series and Parallel circuits

Series and parallel circuits Learning objectives Distinguish between series and parallel circuits State that ammeters are placed in series Predict the current at different points in a circuit

Series Circuit All the components are in the same loop Adding bulbs increases the resistance Increasing the resistance lowers the current A lower current results in dim bulbs

A1 = A2 + A3 Parallel Circuit The bulbs are in a separate loop Adding bulbs does not increase the resistance The current through both bulbs is not lowered Both bulbs are bright A1 A2 A3

Two-way switches Two-way switches allow us to turn a light on or off from both the top and bottom of a stairway.

Two-way switches Moving the switch at either the top or the bottom of the stairway will turn off the light. Turning the switch on at the bottom will turn on the light. On reaching the top of the stairs, the light can be turned off without returning to the bottom of the stairs

Voltage and resistance

Voltage and resistance Learning objectives Use voltmeters to determine the voltage across components in a circuit Control the brightness of a bulb using a variable resistor (Rheostat)

Voltmeters are placed in parallel Conclusion Voltmeters are placed in parallel V1 = V2 + V3 The voltage provided by the battery or power pack is shared across the components in series Voltage V1 V2 V3

Conclusion A variable resistor consists of a long coiled wire. The wire has a resistance and the greater the length of the wire the greater the resistance. Resistance