DC Circuits.

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Presentation transcript:

DC Circuits

Series & Parallel

Two bulbs connected in series

Two bulbs connected in parallel

Series Circuit One pathway for the current to flow Current is the same for the components connected in series Voltage is shared between the components connected in series

Parallel Circuit Multiple (split) pathways for the current to flow Current is shared between the components connected in parallel Voltage is the same for the components connected in parallel

Why do we get more current in the parallel circuit?

Adding resistors When resistors are added in series, the total resistance increases. But when resistors are added in parallel, the total resistance decreases.

Which wire has more resistance?

Resistors in Series RT = the total resistance (aka “effective” resistance or “combined” resistance)

Resistors in Parallel

Example: Calculate RT WARNING: DO NOT attempt to solve this by only using a calculator. YOU MUST SHOW WORKING.

Try this – Find the total resistance 2 kΩ 9 kΩ 3 kΩ 500 Ω 9 kΩ 6 kΩ

Series vs. Parallel Which is better?

Example – Series Circuit 300 Ω 100 Ω 8 V Find the total resistance. Find the current flowing through R1 Find the voltage drop across R1 Find the voltage drop across R2

Example – Parallel Circuit 470 Ω R2 100 Ω 15 V Find the total resistance. Find the current flowing through the cell. Find the current flowing through R1 Find the current flowing through R2

Finish Worksheet #4