Help with GCSE physics homework
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Help with GCSE physics homework

[From: ] [author: ] [Date: 11-05-05] [Hit: ]
will be less across each bulb, and (theoretically) 1/2 the applied voltage, and in a parallel circuit will be the same (the supply voltage) across each.Brightness: The bulbs in series will be less than when in parallel.......
We've basically been told to write about the current, voltage and bulb brightness in series circuits and parallel circuits. I don't really understand what exactly she wants us to do... it doesn't seem to make sense to me :S

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When you have a bulb connected it will be bright. Connecting more bulbs in parallel will not affect this brightness, if they are identical bulbs, they will be as bright as the one in the original circuit. Say you have connected 2 bulbs connected in parallel, the current has different paths it can flow through. This will cause the resistance to halve, and with the same voltage, the current has also doubled, hence twice the amount of energy is dissipated in the circuit, resulting in both bulbs being as bright as the 1 bulb circuit.

In series, the resistance doubles, meaning less current flows (voltage is still the same). The current has now halved, meaning less energy is dissipated and ending up in the 2 bulbs being dimmer when connected in series compared to the original 1 bulb circuit.

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She wants you to describe the differences between series and parallel circuits (presumably using identical bulbs in each).
Current: In series circuit, will be less than in a parallel connection, and (theoretically) 1/2 that in a parallel circuit;
Voltage: In a series circuit, will be less across each bulb, and (theoretically) 1/2 the applied voltage, and in a parallel circuit will be the same (the supply voltage) across each.
Brightness: The bulbs in series will be less than when in parallel.
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