A-LEVEL Physics: 5.3.2: Series & Parallel Circuits (SaveMyExams) Flashcards

(19 cards)

1
Q

in series circuit, current is ___ through all components

A

same

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2
Q

current in parallel circuits:

A

current splits at branches

total current in junction = total current out junction

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3
Q

what determines how current is split at branches in parallel circuit?

A

the total resistance of the components within each branch

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4
Q

the amount of current in each branch of a parallel circuit depends on…

A

total resistance of the components within that branch

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5
Q

how is the emf of power supply shared amongst the components in a series circuit?

A

each component gets a share of emf depending on their resistance

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6
Q

how is the emf of power supply shared amongst the components in a parallel circuit?

A

total voltage of each branch = emf

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7
Q

total voltage of combined cells can be calculated in the same way as voltage: (2)

A

-series: Vtotal = V1 + V2 …

-parallel: Vtotal = voltage of 1 cell

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8
Q

(series) Vtotal = …

A

= V1 + V2 + V3 …

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9
Q

(parallel) Vtotal = …

A

= V1 = V2 = V3 …

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10
Q

Kirchoff’s first law (law of conservation of charge):

A

sum of current entering junction = sum of current leaving junction

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11
Q

junction:

A

point where circuit paths meet

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12
Q

branch:

A

path connecting 2 junctions

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13
Q

if circuit is split into 2 branches, current before split should =…

A

current after the split

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14
Q

law of conservation of energy:

A

energy is never created nor destroyed, only transferred

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15
Q

Kirchoff’s second law:

A

total emf in a closed circuit = sum of potential difference across each component

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16
Q

what is Kirchoff’s second law a result of?

A

law of conservation of energy

17
Q

(series) sum of voltages = …

A

total emf of power supply

18
Q

in a parallel circuit, the voltage is the same across each…

19
Q

closed-circuit loops:

A

parallel circuits are made up of multiple closed-circuit loops.
each closed-circuit loop acts as its own, independent series circuit. separates at a junction.